vigilance

Never relax your vigilance while you live in peace.

你们要居安思危。

We shouldn't relax our vigilance at any time.

任何们都不应该放松警惕。

Guaranteeing the safety of students requires continued vigilance on the part of teachers.

要确保学生安全，教师得常保持警惕。

Better have no war for a thousand days than slacken your vigilance for one day.

宁可千日不战,不可一日不备。

His vigilance never languished.

他的警觉从未松懈下来。