Suddenly he found himself awake and fully alert.
突然他发觉自己醒了过来，而且高度警觉。
我们必须高度警惕。
Suddenly he woke up and was fully alert.
突然他醒了过来而且高度警觉。
Health workers must be fully alert and samples must be taken and sent to laboratories.
卫生工作人员必须保持高度警惕，必须搜集样本并送往实验室。
The young people should be fully aware of its harm, be alert and have self-respect.
作为年轻的一代，我们应该认识到艾滋病的危害。
The young people should be fully aware of its harm, be alert and have self-respect.
作为年轻的一代，我们应该认识到艾滋病的危害。
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