on guard
释义
警惕的，警觉的：在击剑比赛中表示击剑比赛的起始姿势。
例句
1·Police were on guard at Barnet town hall.
警察在巴尼特市政厅值守。
《柯林斯英汉双解大词典》
2·At the outset, it seemed necessary to be on guard against the other two.
一开始，似乎有必要提防另外两个。
3·Two soldiers must be on guard all night.
两名战士必须通宵警戒。
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