What do you mean by peace of mind?

At ease is a Chinese word, pinyin is shàoxī:, which refers to a queue action or military command password in a single soldier's queue action, ordering a team or individual to change from a stand-at-attention posture to a rest posture.

Military action, at ease, means that on the basis of standing at attention, the left foot protrudes about two-thirds of the whole foot along the toe direction, the legs are naturally straight, the upper body remains at attention, and most of the body's center of gravity falls on the right foot. When holding a gun (barrel, cannon), the carrying mode remains the same, and other actions are the same as unarmed. If you feel at ease for too long, you can change your feet yourself.

Being at ease is usually an adjustment after the completion of a subject. When you are "comfortable" in military subjects, you should first look at the direction of the striker and then make yourself comfortable. Action should be quick, accurate and coordinated!

Freedom is also often used for teasing in daily life. For example, if you want to tell someone to shut up, you can jokingly say "Don't worry".