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重点讲解：
1. take back 退回；退还；归还；
例句：I went to the library and took your books back.
我去了图书馆，帮你把书还了。
2. a sum of 款项；金额；
例句：He deposits a sum of money in the bank each month.
他每月在银行存一笔钱。
3. decline to do sth. 婉拒；谢绝；
例句：The band declined to comment on the story.
乐队拒绝对这一报道作任何评论。
4. be home to （强调归属感的）家，家乡，祖国；
例句：Northern Atka Island is home to at least two potentially active volcanic vents.
北阿科它岛是至少两个潜在活火山口的所在地。
n. 估价，评价
