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.

任何候我们都不应该放松惕。

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

要确学生安全，教师得持惕。

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.

他的觉从未松懈下来。