重点讲解：
1. sell on
转卖；倒卖；
eg. Mr Farrier bought cars at auctions and sold them on.
法里尔先生拍得汽车后再将其转手。
eg. The arms had been sold to a businessman; he sold them on to paramilitary groups.
武器出售给了一个商人，他又将其倒卖给了一些准军事组织。
2. take back
退回；退还；归还；
eg. If I buy something and he doesn't like it I'll take it back.
要是我买的东西他不喜欢的话，我就会去退货。
eg. I went to the library and took your books back...
我去了图书馆，帮你把书还了。
eg. I once took back a pair of shoes that fell apart after a week.
有一次，我退了一双刚穿一个星期就开裂的鞋。
3. get rid of
扔掉；丢弃；摆脱；甩掉；赶走；
eg. He believed that his manager wanted to get rid of him for personal reasons.
他认为经理是出于个人原因想开除他。
eg. She will have to get rid of the excess weight on her hips.
她得减去臀部多余的脂肪。