上课时一定要保持安静。
上课时你必须保持安静。
课堂上请保持安静。
The teacher asks the boys to keep quiet in class.
老师告诉这些男生在课堂上保持安静。
In order to guarantee all the members have a quiet practice environment, you must keep quiet in Venues. Close your phones before you come into the class.
为保证广大会员有一个宁静的习练环境，请勿在场馆内大声喧哗，进入教室前请主动关闭手机；
In order to guarantee all the members have a quiet practice environment, you must keep quiet in Venues. Close your phones before you come into the class.
为保证广大会员有一个宁静的习练环境，请勿在场馆内大声喧哗，进入教室前请主动关闭手机；
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