A policeman has to keep on his toes all the time he's on duty.
察在执勤时必须时刻保持覺。
A policeman has to keep on his toes all the time he's on duty.
察在执勤时必须时刻保持覺。
Athletes have to train continuously to stay in peak condition.
运动员必须不断训练才能保持最佳竞技状态。
On this superhighway drivers should keep to a speed of over 80 miles per hour.
在这条高速公路
,驾驶员必须保持每小时80英里以的速度。
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