keep guard 站岗 ; 守卫 ; 守望 ; 警戒
keep guard and stand sentry 站岗放哨
keep guard at the door 把住门口 ; 在门边守卫
keep your guard up 保持防御状态
keep one's guard up 保持警惕
As soon as they had let the fowls out, in the early summer mornings, they had to take their guns and keep guard; and then again as soon as evening began to mellow, they must go once more.
在初夏的早晨，他们一放完鸡，就得拿起枪来站岗；等到天色渐渐柔和下来，他们又得走了。
We must keep our resolve. And we must never let down our guard.
我们不能骄傲自满，我们要坚定决心，我们绝不能放松警惕。
Michael does his best to keep Lincoln calm before a guard breaks up their chat.
Michael尽力使Lincoln冷静下来，一个警卫打断了他们的交谈。
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