keep a sharp look-out
保持警惕
以上为机器翻译结果，长、整句建议使用 人工翻译 。
We should keep a sharp look-out for their disruptive activities.
我们要严防他们的破坏活动。
youdao
It was necessary, when driving at night, to keep a sharp look out for the boulders which frequently rolled down the steep slopes on either hand.
夜晚开车时必须高度注意经常从公路两旁陡坡上滚下的巨石。
Aware of the dangers, pilots keep a sharp look-out for other craft.
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