1.
F-ed is forearmed.
[谚]警惕即警备。
2.
be vigilant, be on the lookout, be on one's guard, be careful.
警惕的，小心戒备着。
3.
We must keep fully alert.
我们必须高度警惕。
4.
The authorities were alerted to the danger.
当局对危险警惕起来。
5.
Look out for squalls.
谨防危险，随时警惕。
6.
we cannot afford to turn a blind eye to them!
我们对此，能不警惕！
7.
He needs a long spoon who sup with the devil.
与鬼打交道，警惕不可少。
8.
The cats, for their part, regarded the chicken warily.
猫们则警惕地看着鸡。
9.
We keep high vigilance.
我们保持高度警惕性。
10.
He was looking ahead vigilantly.
他警惕地注视着前方。
11.
Our friends give us warnings against danger.
朋友提醒我们警惕险滩。
12.
They did their best to keep on their guard.
他们尽量保持警惕。
13.
we are more wary of the enchantments of beauty.
更加警惕美丽的迷惑力。
14.
under the vigilant eye of the examiner
在检查员警惕的目光下.
15.
always on guard against shadowing submarines.
时刻警惕跟踪的潜艇。
16.
We must step up our vigilance.
我们一定要提高警惕。
17.
Be on guard. There are pickpockets around here.
要提高警惕，这里有扒手。
18.
We must however heighten our vigilance.
但是我们应当提高警惕。