1·Police were on guard at Barnet town hall.
警察在巴尼特市政厅值守。
—— 《柯林斯英汉双解大词典》
2·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。
3·Two soldiers must be on guard all night.
两名战士必须通宵警戒。
4·But bid true knowledge stand on guard.
但要吩咐真知识看守着门口。
5·Two soldiers must be on guard all night.
必须有两个士兵整夜站岗。
6·The soldier who is on guard is my friend.
那个站岗的战士是我的朋友。
7·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。
8·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。
9·On guard: Mexico City is at a virtual standstill.
站岗：墨西哥处在一个实际意义上的停滞状态中。
10·While danger threatens, we must all be on guard.
危险正在逼近，我们必须保持警惕。
1·We must also be on guard that we don't confuse such objective qualities as "oiliness" or "big-capness" or "consumerness" with what actually drives stock prices from day to day.
我们还必须要警惕，不能将“石油”或“大盘”或“消费”这些客观因素与每一天真正驱动股价的原因相混淆。
2·After all, cities are hyper-social places, in which residents must be constantly on guard, and have mathematically more opportunity to experience stressful interaction.
毕竟，城市是一个具有超社会性质的地方，身处其中的居民们必须时常保持警惕，并且拥有在数量上占优的机会去体验充满压力的相互作用。
3·With Ruby gem aasm, is it possible to define the not (!) operator on guard functions that return a Boolean result?
用红宝石的宝石协会，它是可能的定义不是(！)警惕的函数返回一个布尔值算子？
4·I must protect myself and be on guard.
我必须保护自己、保持警惕。
5·Be on guard. There are pickpockets around here.
要提高警惕，这里有扒手。
1·On guard: Mexico City is at a virtual standstill.
站岗：墨西哥处在一个实际意义上的停滞状态中。
2·The animal that goes to a favorite food-foraging location and sees signs that a predator was there - but not the predator itself - may be on guard the next time.
在某些情况下，我们会幻想自己的先人又复活了。 “一个动物到它最喜欢觅食地点，看到有个食肉动物一在那里的迹象， 但不是食肉动物本身，可能是上次（下次）在那里站岗。
3·Red means pass where no police on guard; red means pass where it is far away from city center.
红色意味着通过没有警察站岗，红色意味着通过远离城市中心的地方。
4·Two soldiers must be on guard all night.
必须有两个士兵整夜站岗。
5·Many south Korean soldiers on guard no longer present a rough, sunburnt face to the enemy.
南韩很多站岗的士兵不再是一张粗糙、晒得红通通的脸面对敌人了。