男卫生间在哪儿？
A: Excuse me. Where's the men’s room?
打扰一下，请问男卫生间在哪儿？
B: Go along the corridor and you'll see it at the end.
沿着楼道走到尽头你就会看到。
第二句：Where's the gentlemen’s room?
男卫生间在挪里？
A: Excuse me. Where’s the gentlemen's room?
打扰一下，请问男卫生间在哪儿？
B: I don't know, you'd better ask someone else.
我不清楚，你最好问问别人。
其他表达法：
May I use the bathroom?
能借用一下洗手间吗？
I need to go to the bathroom./I have to go to the bathroom.
我得去趟洗手间。