1. learn ... by heart 用心学习，记住
2. combine ... with ... 使...与...结合/联合
3. in that circumstances 如果那样的话
4. replace ... with ... 用...代替...
5. keep a record of 记录
6. comment on ... 对 ... 发表评论
7. at least 至少
8. expect of/from... 从...当中期待
9. in return 作为回报
10. the survey on ... 关于... 的调查
11. differ in... 在...方面不同
12. emerge from... 从...出现
13. be satisfied with... 对...满意
14. play the role of... 扮演...的角色
15. lean over... 弯下身子 俯身于...之上
