adj. vigilant ; sharp-witted
vt. alert
小睡一会儿可以提高机警性，提高工作表现，这在你工作时是很重要的。
A short nap can promote alertness and improve performance, which are important when you are at work.
我们所要做的就是非常机警地避开它。
All we got to do is to look mighty sharp and keep out of it.
浸礼会教堂、卫理公会教堂和长老会教堂，在第二大道和榆树大道的交叉口，它们像机警的哨兵一样面对面地矗立着，教堂的尖塔争相往高处伸。
There were the churches—Baptist, Methodist, and Presbyterian—facing each other at the intersection of Second and Elm like wary sentries, their steeples competing for height.
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