... as sharp as a needle很有鉴别力的, 异常精明的 keep a sharp lookout严密监视 One’s eyes are sharp眼光锐利 ...
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戒备 guard; take precautions; be on the alert; keep a sharp lookout; exercise vigil ..
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keep a sharp lookout for 小心提防
Using all kinds of manners to keep a sharp lookout at all times when passing Gulf of Aden.
过亚丁弯时，在任何时侯都要用各种手段进行有效正规了望。
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