要再次学会游泳,可以用 "relearn how to swim" 来表达。

"Relearn" 是由 "re-" 和 "learn" 组成的。"Re-" 是一个前缀,意思是 "again","once more" 或 "a second time"。"Learn" 是一个动词,意思是 "acquire knowledge or skills through study, experience, or being taught"。所以 "relearn" 意思就是 "to learn again" 或 "to learn something once more".

下面是一些英文例句及其中文翻译:

I had to relearn how to walk after my injury. (我在受伤后不得不再次学会走路。)
She had to relearn how to play the piano after a long break. (她在休息了很长时间后不得不再次学会弹钢琴。)
He's trying to relearn how to speak French after forgetting most of it. (他正在尝试再次学会法语,因为他忘记了大部分法语。)