| 例句 |
His look turned to sternness.他的表情变得严肃起来。He became serious all of a sudden.他突然严肃起来。The mood of the meeting turned solemn when the extent of the problem became known.当问题的严重程度披露后，会议的气氛开始变得严肃起来。Her face suddenly grew serious.她的表情突然严肃起来。His expression became serious as he listened to her story.他听着她的叙述，表情变得严肃起来。 |