We can't relax our vigilance against strangers.

我们不能放松对陌生人的警惕。

The police officer will relax his vigilance only when he is at home.

这位警察只有在家的时候才会放松警惕。

The girl's vigilance shielded her from danger.

那女孩的警觉使她免于了危险。

Extreme vigilance is the best weapon against these types of crimes.

高度警惕是对于对付这类犯罪而言最好的武器 

She stressed the need for constant vigilance.

她强调必须时常保持警惕。

Constant vigilance is necessary in order to avoid accidents.

为了避免意外事故，必须经常保持警惕。

It seems to me they still have some fight left in them. We shouldn't relax our vigilance.

他们余勇可贾，我们不能放松警惕。

The Committee of Vigilance promptly arrested the Knapp brothers and sent them to the Salem Gaol, their cells not far from those occupied by the Crowninshields.

警戒委员会迅速逮捕了克纳普兄弟，把他们也扔进了萨勒姆监狱，囚禁这二人的牢房与克劳宁希尔德兄弟的牢房相距不远。

Constant vigilance is needed to combat this evil.

同这种邪恶作斗争需要时刻保持警惕。