重点讲解：
1. be released from 释放；放出；
He was released from custody the next day.
第二天他被从拘留所里放了出来9RSwL7in22UblbI。
2. in exchange for 作为交换；
Would you like my old TV in exchange for this camera?
用我的旧电视机换这架照相机，你愿意吗？
3. be linked to 联系；关系；关联；
Liver cancer is linked to the hepatitis B virus.
肝癌与乙肝病毒存在关联5!VTnrRi=PQ=_;y1O。
4. in response to 回复；回答；回应；
Millions of people gave freely in response to the appeal for the victims of the earthquake.
为响应救济地震灾民的呼吁，几百万人慷慨相助xgdPEeReq+。