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重点讲解：
1. make changes to 改变...；对...做出改变
Shanghai will make changes to 263 phone booths in Xuhui District.
上海将对徐汇区263个电话亭进行改造。
2. center on 集中在；以...为中心
Her research is centered on the social effects of unemployment.
她的研究课题是失业对社会的影响。
3. look into 调查；观察
They set up a working party to look into the issue.
他们设立了一个特别工作组来调查这个问题。
4. In addition to 除...之外
There's a postage and packing fee in addition to the repair charge.
除修理费之外还有邮寄和包装费。
