Some doctors advise setting aside a certain hour each day for worry.
一些医生建议每天抽出一定时间思忧。
One thing, however, is certain: you should schedule a minimum of one hour of study for each classroom hour.
但有一件事是确定的：每一课时应安排至少一小时学习时间。
At present, 15 Chinese cities allow a 72-hour visa-free entry for nationals of certain countries.
目前，中国15座城市允许对某些国家的公民实行72小时免签证入境。
At present, 15 Chinese cities allow a 72-hour visa-free entry for nationals of certain countries.
目前，中国15座城市允许对某些国家的公民实行72小时免签证入境。
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