1.Okay. I'll vacate your lav, but can you at least grab me an extra stewardess outfit?

好，我这就离开，但你能不能至少给我拿一套姐制服？

2.Ma'am, I'm afraid I'm gonna need you to vacate the lav.

女士 恐怕得请您离开洗手。

3.You might have heard the word " lavatory" or " lav" for short.

您可能听说过“厕所”或简称“lav”这个词。机翻