1. be vigilant, be on the lookout, be on one's guard, be careful. 
   警惕的，小心戒备着。
2. be on one's guard; be cautious or wary about; be alert to. 
   警戒的；谨慎小心的；提防的。
3. He managed to slip one or two good punches past his opponent's guard. 
   他趁对方不注意时狠狠地击出一两拳。
4. On Aug. 15, Virginia's junior guard earned one of 12 coveted spots on the USA Basketball World University Games team and was preparing to travel to Beijing, China, to begin competition. 
   8月15日，这位弗吉尼亚大学三年级后卫是入选美国世界大学生运动会篮球队赴中国北京参赛的12名幸运儿之一。
5. They seemed on guard. 
   他们看来有警惕。

查看更多例句 相关情景会话

• 1. 警惕，警戒；提防
  on guard 站岗，值班...on one's guard 警惕，警戒；提防...be in the habit of 有…习惯(或脾气)
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• 2. 警戒着
  Two men are on guard at the door. 两个人在门口值班....on one's guard 警戒着...I'm just putting you on your guard. 我只是对你警惕.
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• 3. 警惕提防
  400. on occasion(s) 有时间或...401. on one's guard 警惕提防...402. on one's own 独立独自
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• 4. 戒備著
  on one's advice 依某人勸告...on one's guard 戒備著...on one's part 在某方面,代表某人
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