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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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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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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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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