A pilot must remain vigilant at all times.
飞行员必须随时保持警惕。
He warned the public to be vigilant and report anything suspicious.
他告诫公众要保持警惕，报告任何可疑情况。
我们必须保持高度的警惕。
我们必须时刻保持警惕。
Therefore, we must be vigilant!
所以大家一定要警惕！
We are very vigilant as soldiers.
作为战士我们要时刻保持警惕。
我们需要保持警惕。
He says people must remain vigilant.
他说，大家必须继续保持警惕。
I sat up straight to stay vigilant.
我立刻坐直身保持警惕。
Rule 7: Remain vigilant and always question.
规则7：保持警惕并一直持有怀疑态度。
One has to remain vigilant at all times.
参与者在任何时候都要保持警觉。
Of course, it is a good thing to be vigilant.
当然了，保持警惕是件好事。
For this reason, he adds, we must be vigilant.
他还说，我们必须对此保持警惕。
The Chinese side will stay vigilant about that.
中方将继续对有关活动保持警惕。
If this is true, we must certainly be vigilant.
这如果是事实，就很值得我们警惕！
A vigilant police force helps to control crime.
一支警惕着的警察队伍有助于遏制犯罪。
The need to be vigilant is even more urgent now.
如今，这些问题更加迫切地需要引起人们的警惕。
This progress could be lost if we are not vigilant.
如果我们不保持警觉，上述进展就可能消失。
They become more vigilant and keep on the move more.
它们变得更加警惕，移动也更加频繁。
They are masters of it, so you must be ever vigilant.
他们是玩弄这些把戏的能手，所以你们必须变得更加的警惕。
All personnel should be vigilant against fire hazards.
所有的工作人员都应警惕火险。
They can become very sick very quickly so be vigilant.
他们的病可以非常迅速地转坏，所以必须提高警觉。
We must and we will remain vigilant at home and abroad.
无论在国内国外，我们必将保持警惕。
We're vigilant, and know that freedom must be defended.
我们是警醒的，而且知道自由一定被防护。
But as we are showing again this weekend, we remain vigilant.
但是正像本周末我们再次显示的那样，我们依然保持警惕。
Be especially vigilant with the kids when they go to swim.
孩子们去游泳的时候尤其要保持警惕。
We must — and we will — remain vigilant at home and abroad.
我们必须须——也必将——在国内和国外保持高度警惕。
We must — and we will — remain vigilant at home and abroad.
我们必须须——也必将——在国内和国外保持高度警惕。
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