keep one's gravity
你让我在新闻发布会上保持严肃？
You want me to be serious in a press conference?
youdao
直到访问结束她一直保持严肃的态度。
She maintained her serious mien until the interview was over.
能不能在升旗时始终保持严肃的态度；
Could we keep towards the flag-raising as a serious attitude?
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