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
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