2.a train carrying freight; a courier carrying messages.
运货火车;送消息的信使
3.the US courier market has been more or less sewn up by two companies.
美国市场几乎由两家公司垄断。
4.You can see problems that aren't appear in a double-spaced Courier typescript. ( Yes, you could do this in the old days on galley proofs, but that was an expensive luxury for most writers).