She's like a butterfly. She flits in and out of people's lives.

她像一只蝴蝶，每天在人前人后飞来飞去。

《牛津词典》

And soon I shall go to sleep, and die as they call it, but I shall wake up with beautiful wings to fly with, like a butterfly.

但是当我醒来就会拥有美丽的翅膀去飞，就像一个蝴蝶。

youdao

Love is like a butterfly. It goes where it pleases and it pleases where it goes.

爱情就像一只蝴蝶，它喜欢飞到哪里，就把欢乐带到哪里。

youdao

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