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What does formal mean?

Pinyin:

zhèng zhòng qí shì

Explanation:

Solemnity: Caution and seriousness. Describe a serious attitude when talking and doing things.

Source:

Cao Qingxue Qin's fourth story of A Dream of Red Mansions: "So if you are serious, you will enter the door in three days."

Example:

Sun Yingjun stood quietly in front of the wall reading the slogan with his hands on his back. (Chapter 6 of Feng Deying's "Winter jasmine")