A:What's the matter?怎么啦?
B:Which subway should I take to get to the East Side?我要搭哪趟地铁才能去东区。
A:Oh, you have to take the shuttle to Grand Central.噢,你必须搭去Grand Central的短程火车。
B:Which train is that? Which platform does it leave from?是哪一辆?它从哪个站台驶离?