Everyone stays at a place long enough needs to known where a toilet is.I tried to find one when I frist time visited the Divinity School Library,the older school in Yale University,My common sense told me that how it was impossible not to find one in the library,so I kept trying .Finally I found a door which was a single word:WOMEN.As I opened the door,I was surely I made a mistake.I came out immediately because where I had entered was a room much large than my living room.It looked like a sitting room in a hotel.Then I remembered other door in the room,so I went back and open the door.And there it was!