What does it mean to have a thunder on your chest and a flat face?

"There is thunder in the chest and the surface is like a lake" describes a person who is full of passion or anger inside, but keeps calm and calm on the surface.

This idiom uses a rhetorical device of contrast to describe a person's inner excitement and outward calm through the contrast between Lei and Pinghu. Thunder represents inner passion, anger or strong emotion, while Pinghu symbolizes external calm, calmness, peace and harmony.

When a person has thunder in his chest, it means that he is excited, angry or full of strong feelings. However, despite his inner excitement, he can keep his appearance calm and not show it, as if he were as calm as a lake.

This idiom is often used to describe people who are full of passion, anger or strong feelings, but can control their emotions and don't show them easily. They may be able to keep a calm mind and not be shaken by the outside world when facing setbacks, difficulties or pressures.

This idiom conveys an image of the difference between inside and outside, and the contrast between appearance and heart. It emphasizes that when facing difficulties or challenges, one should keep inner peace and calm and not be influenced by emotions, so as to better cope with problems.