condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis" 同义词：alert,
例句与用法
1.
The young girl was never still for a second . she would always be on the qui vive waiting for something new or exciting 这个小女孩老是不安分。她总是渴望出现一些新鲜事或令人兴奋的玩意。
2.
Mr bloom , actuated by motives of inherent delicacy , inasmuch as he always believed in minding his own business , moved off but nevertheless remained on the qui vive with just a shade of anxiety though not funkyish in the least ，又一向认为不应去多管旁人的闲事，所以移步走开了。他虽然丝毫也没感到害怕，却稍微有点儿放心不下，就警惕地停留在那里。
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