He likes to take a walk in the park at dusk.

In organic chemistry, the concept of cis-trans isomers is important.

In organic chemistry, the concept of conformational isomers is very important.

We should always remember the power of Kannon in difficult times.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.