n a United Nations agency to coordinate international health activities and to help governments improve health services
pron. 谁
1. Who is your favorite teacher?
你最喜欢的老师是谁？
2. Do you know who called me yesterday?
你知道昨天是谁给我打电话的吗？
3. Who wants to join us for lunch?
谁有兴趣和我们一起吃午餐？