重点讲解：
1. shoot down 击落；
例句：The wings of the bird fluttered after it had been shot down.
那鸟被击落后翅膀仍在抖动,HcAy%XywjC@xH。
2. depend on 取决（于）；有赖（于）；
例句：How much can you get depend on how much you pay.
你能得到多少取决于你付出了多少UsR@nxUTDTkiOh。
3. end up 最终；结果；到头来；
例句：I must play my spare time well, or I end up doing nothing.
我必须善于利用空闲的时间，否则生命将会在无所事事中告终6g+hQr3u~yOih2。
4. a bunch of 大量；大批；
例句：John has a bunch of friends and often gets their help.
约翰有一帮朋友并且经常得到他们的帮助OW9lFvTf5d(pvDH!IX。
5. on one's behalf 为（某人）；替（某人）；
例句：He's not here. I'll sign for these documents on his behalf.
他不在，我代他签收这些文件~u3@Z@gt2xv!39)nN。