keep to the concept of all-time preparedness;be on one's toes all the time;always be on the alert;be always vigilant ;
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.
Surprise visits help to keep the staff on their toes.
突击巡察有助于使员工常备不懈。
简答网 · 中考英语
简答网 · 初中英语作文
简答网 · 双语娱乐资讯
简答网 · 高考英语