on one's guard　隐藏摘要 
警惕，警戒；提防
on guard 站岗，值班
on one's guard 警惕，警戒；提防
on hand 现有；在手边；临近
http://cn.wordmind.com/ecmaster-cgi/Csearch.cgi?kwd=on&bool=and&word=im - 基于35个网页
警惕
on one's feet 站立着
on one's guard 警惕
on one's honeymoon 度蜜月
http://renfelix.blogchina.com/renfelix/6587777.html - 基于21个网页
警惕，提防
on one hand 一方面
on one's guard 警惕，提防
on one's own 独立，靠自己的力量；独自地
http://song.15150.com/song/557/967557.shtml - 基于1个网页
警惕；提防
on the one hand 一方面
on one's guard 警惕；提防
on one's own 独自，独立地
http://blog.sina.com.cn/s/blog_4ca35aec010007x7.html - 基于1个网页
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