Excuse me. Where's the men’s room? 打扰一下，请问男卫生间在哪儿？

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。

Where's the gentlemen’s room? 男卫生间在挪里？

Excuse me. Where’s the gentlemen's room? 打扰一下，请问男卫生间在哪儿？

I don't know, you'd better ask someone else. 我不清楚，你最好问问别人。