王先生在一家大酒店参加朋友的宴会，中途他出去打了一个电话，回来时感到内急，附近又没有服务员指点，只发现有扇门上写着“本店职工使用”的字样。推开一看，里面果然是上下两间厕所，但都只标明了是“WC”（洗手间），并没注明男用还是女用。王先生急于解决问题 Mr. Wang attended a friend’s party at a big hotel. He went out for a phone call on the way. When he came back, he felt anxious. There were no waiters in the vicinity. He only noticed that there were words “Our staff used” on the door. When you open the door, there are really two toilets up and down, but they are only marked “WC” (toilet) and are not indicated for men or women. Mr. Wang is eager to solve the problem