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- Be on guard when somebody flatters you. 有人奉承你时，一定要当心。
- While danger threatens we must all be on guard. 危险正逼近，我们必须保持警惕。
- We must be on guard against hidden enemies. 我们必须警惕暗藏的敌人。
- We thought it best to be on guard. 我们觉得最好还是保持警锡。
- He told us again and again to be on guard. 他一再要我们提防。
- We should be on guard against the enemy's invasion. 我们要防范敌人的入侵。
- We should be on guard against such people. 我们应警惕这种人。
- You should be on guard against pickpockets. 你要谨防扒手。
- Be on guard against those who are jealous of your success. 要提防那些嫉妒你的成功的人。
- Two soldiers must be on guard all night. 必须有两个士兵撤夜站岗。
- Cowboys should be on guard against the attacks from wild animals. 牛仔必须提防着野兽的袭击。
- We must be on guard not to let the enemy spies worm in . 我们必须警惕，不让敌特钻进来。
- The citizens were warned to be on guard against a sudden night attack. 市民们得到通知，要提防夜间的突然袭击。
- We must be on guard not to let the enemy spies worm in. 我们必须警惕,不让敌特钻进来。
- When we go shopping,we should be on guard against pickpockets. 当购物的时候，我们应该提防扒手。
- We should be on guard against the enemy rs invasion. 我们要防范敌人的入侵。
- Be on guard against the professional killer of black qigong's! 警惕当代黑色气功现象!
- The police are on guard at that building. 警察守卫着那栋大楼。
- Be on guard! Be alert! You do not know when that time will come. 你们要谨慎,儆醒祈祷,因为你们不晓得那日期几时来到。
- 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。
