严肃
word B2- (of an atmosphere etc) solemn; grave; serious
- (of a manner etc) earnest; severe; exacting
- to strictly enforce
Its characters
From the library
父亲摇了摇头，严肃地说：“只有热情是不能当饭吃的啊。
四个人坐在客厅的沙发上，表情都很严肃。
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