vigilance

['vidʒiləns]

n.警戒, 警惕, 【医】失眠症

例句与用法：

The price of liberty is eternal vigilance.

自由的代价是永久提高警惕。

You cannot afford to relax your vigilance for a moment.

警惕性是万万不可放松的。

In spite of vigilance a polar bear escape from the zoo.

尽管警戒很严，北极熊还是逃出了动物园。

Police's vigilance was eventually rewarded.

警方时时警戒终有所获。

详细释义：

n.[U]

1. 警戒; 警觉; 警惕(性)[(+against)]

Do not relax your vigilance.

不要放松警惕。

2. 【医】失眠症; 惊醒症