重点讲解：
1. contribute to （为…）做贡献；
例句：Many specialistic techniques contribute to archaeology.
许多专业技术对考古学作出贡献%U#aZ[Mw17Z=T4iSvJ。
2. sign up 签署；签约；报名；
例句：But not all parts of the industry hae signed up.
但并不是行业内的所有企业都签署了此协议uQI|ltE;,;w。
3. be aimed at 旨在；目的是；
例句：Analyst said the move was aimed at making the company more attractive to international investors.
分析人士说，这个举动是为了让公司对国外投资者更具有吸引力aZX3@!^]Og06CiCi!upR。
4. prevent sb. from doing sth. 阻止；制止；阻碍；
例句：Ways must be found to prevent the poisonous gases from polluting the air.
一定要找到办法防止有毒气体污染空气HNV&HF~;uJ.W3C(Dcj。
5. in response 回复；回答；回应；
例句：Shares in financial institutions immediately slumped in response.
作为回应，金融机构的股票随即大幅下挫VgMQOWY-l;8y。