"Gradually regain strength" 是一种描述逐渐恢复体力的方式。这个短语的来源可能是因为 "regain" 在这里的意思是 "to get back something that has been lost or taken away"，而 "strength" 指的是 "the physical or mental power that allows you to do something"。
下面是一些使用这个短语的例句，并提供了中文翻译：
After being sick for a week, I'm finally starting to gradually regain my strength. (我生病了一周后，我终于开始逐渐恢复体力了。)
It's important to take it easy and allow your body time to gradually regain strength after an injury. (重要的是要慢慢来，让你的身体有时间逐渐恢复体力。)
The doctor advised her to rest and gradually regain strength before returning to work. (医生建议她休息，并在回到工作之前逐渐恢复体力。)