On the platform, the guard blew his whistle.
站台上，警卫吹响了他的哨子。
Police were on guard at Barnet town hall.
警察在巴尼特市政厅值守。
The armed forces were on high alert to guard against any retaliation.
武装部队保持高度警惕，以防发生任何报复行为。
The police have questioned him thoroughly, and he'll be on his guard.
警察已仔细盘问了他，因此他会保持警惕。
At the outset, it seemed necessary to be on guard against the other two.
一开始，似乎有必要提防另外两个。
Men on guard duty sometimes think they see something moving to one side of them．
值班的人有时会以为看到了什么东西向他们这边移动。
Be on your guard against pickpockets.
提防扒手。
This fellow is very crafty; we had better be on our guard.
这个家伙诡计多端，我们可得小心点儿。
All this time, the mother is constantly on guard.
在这段时间内，章鱼母亲一直在警戒状态。
Two soldiers must be on guard all night.
两名战士必须通宵警戒。
The world is alert and on guard as never before.
世界从没有向现在这样保持警惕和戒备。
Thus, you should be on guard against this confused mapping.
因此，您应该谨防这种有混淆的映射。
If we are alert enough, we'll notice that we are always on guard.
如果我们足够警惕，你会发现我们经常是在站岗。
He then spoke earnestly to the Delaware who stood on guard.
然后，又对守卫在门口的特拉华人匆匆嘱咐了几句。
Security was tight around the launch site, where about 1, 600 police were on guard.
安全措施紧密围绕发射场，其中约1600名警察守卫。
There are soldiers on guard at the gate.
大门口有士兵在守卫。
You should be on guard when a stranger comes to your doors.
当陌生人站在你家门前是，你应该有所堤防。
Be on guard against those who try to lie themselves into our confidence.
要警惕那些试图用谎言来骗取我们信任的人。
But bid true knowledge stand on guard.
但要吩咐真知识看守着门口。
While danger threatens, we must all be on guard.
危险正在逼近，我们必须保持警惕。
The soldier who is on guard is my friend.
那个站岗的战士是我的朋友。
Two soldiers must be on guard all night.
必须有两个士兵整夜站岗。
"I already do a lot," I said, immediately on guard.
“我已经做得不少了，”我马上警觉起来，说道。
I am always on-guard for thieves in my store.
我总是对进入我店里的小偷十分警觉。
Against that dreadful design the church stands ever on guard.
对于这个可怕的计谋，教会是时刻提防的。
If someone randomly does something kind for me, I'm on guard.
如果有人随意就为我做好事，我会提防。
I must protect myself and be on guard.
我必须保护自己、保持警惕。
Put none but Americans on guard tonight.
今夜只让美国人担任警戒。
Put none but Americans on guard tonight.
今夜只让美国人担任警戒。
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