Describe a means of transportation in a paragraph

I started riding a bicycle when I was seven years old. Bicycles are the simplest and most popular means of transportation, and children, young people, and the elderly can sit on them. Saying it's simple, in fact, it's not simple, according to my riding experience, some questions I don't understand asked my father, I think the whole body of the bicycle is condensed with the principle of science:

Its motion includes the rotation and translation that we learned in third-grade mathematics; The brake lever is a simple lever that can be used to stop the car with very little force; Its wheels, which are taut with dozens of steel wires, are very light and strong, and can withstand a load that is dozens of times heavier than its own .......

Bicycles are the most environmentally friendly, safest and most convenient means of transportation, no need to refuel, no need to consume electricity, no exhaust gases, parking occupies very little space, and unsafe accidents rarely occur. No matter sunny, rainy, foggy, snowy days, you can sit and walk; Whether it is a high-end highway, a crowded street, a country road, a rugged mountain road, or a manor ridge, you can walk around. Bicycles are both means of transportation and fitness equipment, often mounted, can play a role in exercising, enhancing physical fitness, and activating the network.

There are more and more motor vehicles, the climate is getting warmer and warmer, and the destruction of the atmospheric environment is the main culprit, and the bicycle tree is well-deserved as an environmental hero! In the Netherlands, one of the richest countries in Europe, more than 30% of people use bicycles as a means of transportation, and they have always maintained the title of bicycle kingdom. For the sake of environmental protection, for the sake of health, for the sake of safety, let's learn from the Dutch and ride more bikes and less motorized vehicles.

Bikes don't go out of style, long live bikes!

Do you have a favorite mode of transportation? There are many ways I like transportation, there are cars, there are trains, there are planes, there are bicycles, ......One of my favorites is high-speed rail.

The high-speed rail looks like a long dragon and is several meters long. Each carriage is different, one to three carriages are first class, business carriage and nose; Carriages 4 to 16 are dining room cars and second-class carriages.

The seats in the first class car are red, so you can turn the seat to face each other, and if you want to put a water cup, open the shell of the small table from the left, and then take out the small table and put it away; If you want to sleep, press the black button under the small table and you can lie down and sleep.

The seats in the second-class carriage are blue, and unlike the first-class carriage, the seats cannot be rotated, and you cannot lie down to sleep, but the limbs are very warm there, and you can feel warm when you can put a small quilt on your body. Food will be delivered every few minutes, so you won't go hungry in the car.

In particular, the speed of the high-speed train is amazing, it can reach 300 kilometers per hour, it moves like the wind, and the beautiful scenery outside the window is running fast backwards. At such a high speed, the car will not shake at all, and it is very stable, and people will not feel the shaking at all when sitting in the seat.

Bicycles, electric cars, cars, subways, light rail, boats, trains, airplanes.

(1) The main reason why water is commonly used in the coolant of automobile engine is that the specific heat capacity of water is large, and the water absorbs more heat when the same temperature rises;

2) The truck is installed with more wheels, which is to reduce the pressure on the ground by increasing the stress area;

3) The cause of traffic accidents is mainly caused by excessive speed and excessive load, so it can be analyzed from the control of speed and load capacity, and it can be answered: the driver of the car and the front passenger wear seat belts; The front seat of the car is equipped with airbags; Don't speed; Do not drive overloaded; Pedestrians are required to obey traffic rules, etc.;

4) Heat absorbed by water: q=cm t=?℃）15kg×（40℃-20℃）=；

Therefore, the answer is: (1) the specific heat of water is greater; (2) Reduce the pressure of the wheels on the ground (3) Speed limit and load limit (4).