adj.注意的;警惕的;<古>不眠的;醒的
用作形容词 (adj.) You must be watchful of your health.
你必须注意你的健康。
They were not very watchful of the traffic lights.
他们并不很注意红绿灯。
We should be watchful of computer viruses.
我们应该警惕计算机病毒。
The guard should be watchful during the night.
警卫在黑夜里也应该警醒。
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