keep to the concept of all-time preparedness;be on one's toes all the time;always be on the alert;be always vigilant ;
Surprise visits help to keep the staff on their toes.
突击巡察有助于使员工常备不懈。
They were constantly on the alert not to be taken by surprise.
他们一直处于常备不懈状态以防突然袭击.
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