What does it mean to be clever in using the day and clumsy in using the night ?

It means that this method is very clever to use during the day, but it is quite clumsy to use at night.

From the Northern Song Dynasty. Li Fang, Li Mu, Xu Xuan.

and other scholars compiled a literary essay "Zheng Ren Escapes the Summer" in the "Taiping Yulan Personnel Department".

Original text: Zheng people have people who escape the heat under the lonely forest, and the shadow of the day changes, and they migrate from the yin. At dusk, he sat under the tree. And the shadow of the moon shifts, and the return migration is from the yin, and the dew is wet in the body. Its yin is gone, and its body is more wet, which is skillful in using the day and clumsy in using the night.

Translation: Zheng Guo had a man who was chilling under a separate tree, the sun was moving in the sky, and the shadow of the tree was also moving on the ground, and he also moved his sleeping seat with the shadow of the tree.

When dusk came, he put the mat under the tree. The moon moved in the air, and the shadows of the trees moved on the ground, and he moved his seat with the shadows of the trees, and the dew drenched his whole body. The shadows of the trees moved farther and farther away, and his body became more and more wet.

This method is clever to use during the day, but rather clumsy to use at night.

Original text: It is clever in using the day and clumsy in using the night. -- Taiping Yulan Personnel Department

Translation: (This method) is clever to use during the day, but rather clumsy to use at night.

Meaning: Zheng Ren Escapes the Summer" tells the story of Zheng people moving the mat to the shade of the tree during the day to escape the heat, and at night due to the elongation of the shadow of the tree under the moonlight, Zheng Ren did not spread the mat under the tree, but moved to the shade of the tree as in the daytime, far away from the trunk, in fact, there was no shelter, so he was wet by the dew.

The main detail of this story is that sleeping in the shade of a tree at night not only does not protect you from the heat, but you get wet. Find a good angle of irony and analyze cause and effect.

This parable tells people that the external conditions are constantly changing, and we must solve the problem with the development of the situation, rather than just using the old vision and the old way to solve the new problem, otherwise we will hit a wall and suffer disasters; The objective world is constantly moving, developing, and changing, and we must also understand and adapt to such developments and changes, and we must not stick to conventions. Zheng people used the method of avoiding the heat to deal with the dew at night, of course, it could not achieve the desired purpose. If we treat things that change with narrow experience, we will inevitably be punished by objective laws.

This parable tells people that external conditions are constantly changing, and we must recognize and adapt to these developments, and we must not stick to the rules.

This method is used during the day.

It's clever, and it's pretty clumsy to use at night.

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This method is clever during the day and clumsy at night.