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。

《牛津词典》

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。

youdao

Here are a few things I've found helpful to reduce the transition period from being asleep to becoming fully alert.

这里是一些能有效地帮你从半睡半醒到神清气爽的小窍门，我相信它们会对你很有帮助。

youdao

This is a fully felt, morally alert, marvellously acted piece of work.

NEWYORKER: The Messenger

The goal of this test is to help identify additional changes, on top of those improvements that we already know are needed, that should be made as we work to build a modern and fully accessible public emergency alert system.

FORBES: Will Right-Wing Radio Skip The National Emergency Test?