What does it mean to be unbearable ?

Unbearable means that you can't bear to recall past experiences or situations.

What does it mean to be "unbearable"? Answer: "Unbearable" is not to be able to look back at what you have done and the road you have walked. This can't mean that I can't get over it in my heart.

Interpretation: tolerable; Looking back: looking back, recalling. It means that when you think about the past, you feel painful and can't bear to remember it.

Antinym: Aftertaste.

Synonym: deep pain, painful experience.

I can't bear to recall past experiences or situations.

Recalling the past, I am sad and have no place.

Discharge cooling is another type of convection cooling. Unlike regenerative cooling, the coolant used for exhaust cooling absorbs heat to the thrust chamber and is discharged out of the combustion chamber instead of entering the combustion chamber to participate in combustion. Direct drain coolant reduces the thrust chamber specific impulse, so the coolant flow for drain cooling needs to be minimized while only using drain cooling at the outlet section of the nozzle that is relatively less heated.

There is also radiative cooling, in which the heat flow is transferred from the combustion products to the thrust chamber, and then the heat is radiated by the thrust chamber wall to the surrounding space. Radiative cooling is characterized by simplicity and small structural mass. It is mainly used in the extension section of large nozzles and the thrust chamber of small thrust engines using high-temperature resistant materials.

When cooling in the thrust chamber of the tissue, a relatively low temperature liquid or gas protective layer is established on the surface of the thrust chamber wall to reduce the heat flow to the thrust chamber wall, reduce the wall temperature, and achieve cooling. Internal cooling is mainly divided into three methods: internal cooling (shield cooling), membrane cooling and diaphoretic cooling of head tissues. After the internal cooling measures are adopted in the thrust chamber, the mixing ratio near the wall of the combustion chamber is different from the optimal mixing ratio in the central area (in most cases, the near-wall layer rich in fuel is used) due to the need to reduce the temperature of the protective layer, resulting in the uneven distribution of the mixing ratio along the cross-section of the combustion chamber, so that the combustion efficiency is reduced to a certain extent.

Membrane cooling is similar to shield cooling in that it cools the thrust chamber wall by establishing a uniform and stable coolant film or air film protective layer near the inner wall surface, except that the coolant used to establish the protective layer is not injected by the injector, but is supplied through a special cooling belt. The cooling band is generally arranged in a cross-section of the combustion chamber or the convergence section of the nozzle. There can be several cooling bands along the length of the combustion chamber.

In order to improve the stability of the membrane, the coolant often flows through the gaps or small holes in the cooling belts, and when sweating is used, the thrust chamber wall or part of the inner wall is made of porous material with a pore diameter of tens of microns. Porous materials are usually sintered with metal powders or pressed with metal mesh. In this case, the number of pores per unit area is increased by making the micropores in the material as evenly distributed as possible.

The liquid coolant penetrates into the inner wall, creating a protective film that reduces the density of the heat transferred to the wall. When the flow rate of liquid coolant used for sweat cooling is above a certain threshold, a liquid film is formed near the wall of the thrust chamber. When the coolant flow rate is below the critical flow, the inner wall temperature will be higher than the coolant boiling point at the current pressure, and some or all of the coolant will evaporate, forming an air film.

In addition to the above thermal protection, there are other thermal protection methods such as: ablation cooling, thermal insulation cooling, hot melt cooling and composite protection of chamber walls. 3. Thermal protection scheme of high enthalpy gas generator Based on the above methods and the actual situation, the thermal protection method of high enthalpy gas generator is obtained.

The combustion chamber of a high-enthalpy gas generator differs from that of a liquid rocket engine, eliminating the front thrust chamber part, making its structure simpler and more effective. Then, the thermal protection involved is the thermal protection part of the combustion chamber wall. As the fuel enters the combustion chamber, it quickly decomposes and releases large quantities.

The meaning of "unbearable" refers to the painful thought of the past, so it is unbearable to recall it; Describe the feelings of the past after a dramatic change in circumstances or thoughts. It is generally used as a predicate and a definite in a sentence. It was first published in Don Dai Shulun's "Crying Zhu Fang".

Excerpt from the idiom story:

One day Li Yu. Occasionally, when he went out to the city, he saw that the banners of the Song army were outside the city, so he hurriedly went to call for reinforcements, but it was too late, and the Song army wiped out the Southern Tang Dynasty in the winter of this year.

The last supporting army finally broke through Jinling.

Li Yu was forced to surrender and was taken to Kaifeng.

Li Yu wore a white coat and hat, and accepted Zhao Kuangyin with trepidation.

of summons. Zhao Kuangyin did not kill him, insultingly named him a disobedient marquis, and placed him in the city, he was nominally a marquis, but in fact lived an embarrassing life like a prisoner.

The meaning of the idiom: What is unbearable is not the beautiful or painful past, but the expectation that cannot be looked back on, and the contrast of the current situation. When one cannot go back to the past, the only thing one can do is not look back to escape the impact of contrast.

Everyone has more or less unbearable memories, but people must learn to face it strongly, with the attitude of "everything is a floating cloud" to fight against unbearable retrospectiveness, and face life with an optimistic and strong attitude.

Sentence formation: 1. What is the purpose of mentioning that unbearable experience now?

2. There are unforgettable chapters in youth, and there are also chapters that are unbearable.

3. The sad past is unbearable.

4. To put it simply, this is an unbearable year and fiscal quarter.

Unbearable means not being able to endure the pain of looking back. It mostly refers to the pain of recalling bad or unpleasant things in the past, so you can't bear to look back.

Pronunciation: bù kān huí shǒu.

Source: Li Yu "Poppy Beauty".

When is the spring flower and autumn moon, and how much do you know about the past! Xiaolou had another east wind last night.

The old country is unbearable to look back at the moonlight.

synonyms: deep pain, painful experience.

Antonym. Overjoyed and overjoyed.

It's unbearable to look back and make sentences.

1. Glimpse of the past, unbearable to look back on.

2. Ten years of catastrophe.

Sven sweeps; It's hard to look back on.

4.It's hard to look back on the sad days.

5. The past is unbearable, and true happiness is far away.

6. The past is unbearable, and looking back is just nostalgia.

Unbearable means that you can't bear to recall past experiences or situations.

From]: Nantang Li Yu's "Poppy Beauty" words: "When is the spring flower and autumn moon, how much do you know about the past!" Xiaolou had another east wind last night, so the country could not afford to look back at the moonlight. ”

Translation]: When will this year's time be over, and how many past events do you know! Last night, the spring breeze blew on the small building again, how could I bear the pain of remembering my homeland on this night when the moon was in the sky.

Grammar]: verb-object; as a predicate, a definite; Statements used for emotion.

synonym pain and pain [ tòng dìng sī tòng ].

Explanation]: It refers to the feeling of grief after the mood has calmed down, and then recalls the pain suffered at that time. It often contains the meaning of being wary of the future.

From]: Tang Hanyu's "Book with Li Ao": "Thinking about it now, like a person who is in pain, when he thinks about pain, he doesn't know how to deal with himself." ”

Translation]: I didn't realize it when I did it, but now I think about it, like a person who has ended in pain, and when he thinks of pain, he doesn't know how to treat himself.

Grammar]: complex; as a predicate, a definite, an adverbial; Expresses the lessons learned after the setback.

It's hard to look back.

Pinyin]: bù kān huí shǒu

Interpretation: tolerable; Looking back: looking back, recalling. It means that when you think about the past, you feel painful and can't bear to remember it.

Example sentence]: If there is a person, then I am here today, although it has been a hundred years, I have not been able to take a moment. Qing Anonymous's "Du Shiyanzhi".

It's hard to look back on what it meant to me, you know?

Unbearable paraphrase:

Kan: tolerable; Looking back: looking back, recalling. It means that when you think about the past, you feel painful and can't bear to remember it.

It's hard to look back. Pronunciation: bù kān huí shǒu.

It's hard to look back.

Pinyin]: bù kān huí shǒu

Interpretation: tolerable; Looking back: looking back, recalling. It means that when you think about the past, you feel painful and can't bear to remember it.

I don't want to think about the past, I don't want to think about the past, I don't dare to think about the past.

Explanation: It means that remembering things from the past makes you feel painful, so you can't bear to remember them.

Kan: tolerable; Looking back: looking back, recalling.

unbearable to look back: bù kān huí shǒu

Source: Nantang Li Yu's "Poppy Beauty" words: "When is the spring flower and autumn moon; How much do you know about the past! Xiaolou had another east wind last night. The old country is unbearable to look back at the moonlight. ”

Allusion: Don Dai Shulun's "Crying Zhu Fang": "The most unbearable place to look back, the smoke of Jiuquan is cold and the trees are green." It is also seen in "The Second Main Words of the Southern Tang Dynasty, Li Yu's "Yu Beauty": "Xiaolou had an east wind last night, and the country is unbearable to look back at the moonlight."

1. Unbearable to look back, the Chinese idiom, pinyin is bùkānhuíshǒu, which means that you will feel pain when you think about the past, and you can't bear to remember it. From "Crying Zhu Fang".

2, selling boy Tang Dai Shulun's "Crying Zhu Fang": "The most unbearable place to look back, the smoke of Jiuquan is cold and the trees are green. It is also seen in "The Second Main Words of the Southern Tang Dynasty, Li Yu's "Yu Beauty": "Xiaozhong Liquid Wang Lou had an east wind last night, and the country could not afford to look back at the moonlight. ”

Unbearable return (pinyin: bù kān huí shǒu) is an idiom.

Unbearable to look back refers to the fact that the past is painful to think about, so I can't bear to recall it again; Describe the feelings of the past after a dramatic change in circumstances or thoughts. It is generally used as a predicate and a definite in a sentence.

Examples of applications. Qing Anonymous's "Du Shi Yanzhi": There are those who are honest and unbearable, so I am here today, although it has been a hundred years, I have not been able to take a moment. Tan Mu cracked.

Qing Wu Zhaoren's "The Strange Status Quo Witnessed in Twenty Years" Chapter 65: "I was exhausted from the trouble, and then the child was unscrupulous, and I got into a disaster, and I broke up my family. It's really hard for me to look back! ”