as fresh as a daisy 精神饱满；精力充沛

【例句】
I am sure you will be as fresh as a daisy after a good night's rest.
我相信只要你好好休息一个晚上，一定会变得精神饱满的。

She looked fresh as a daisy after her short sleep。
她小睡之后看起来精神很好。