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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。
- A sentry stood on guard at the corner. 一个哨兵在角落里站岗。
- There are soldiers on guard at the gate. 大门口有士兵在守卫。
- Be on guard against those who are jealous of your success. 要提防那些嫉妒你的成功的人。
- 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。
- 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 should be on guard against the enemy's invasion. 我们要防范敌人的入侵。
- The police are on guard at that building. 警察守卫着那栋大楼。
- 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。
- The man below there are always on guard. 下面的人又总是片刻不离地守着。
- Put none but Americans on guard tonight. 今夜只让美国人担任警戒。
- They should be certainly on guard . 他们早该防范一些的。
- Two soldiers must be on guard all night. 必须有两个士兵撤夜站岗。
- They startle easily and are often on guard. 处于防御状态。
- Henry places himself on guard in the manner of well taught boxer. 亨利像一个经过名师传授的拳击家那样摆好防御的架势。
- Tom saw a young man with a rifle on guard at the entrance. 汤姆看到一位持枪的年青人在门口站岗。
