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重点讲解：
1. thanks to 幸亏；归因于；
It was all a great success─thanks to a lot of hard work.
由于尽心竭力，这才大获成功。
2. in person 本人；直接；当面；
You must collect the mail in person and take along some form of identification.
你必须携带本人身份证明亲自来取邮件。
3. let alone 更不用说；
There isn't enough room for us, let alone any guests.
连我们都没有足够的空间，更不用说客人了。
4. cut down on 削减；减少使用；
He cut down on coffee and cigarettes, and ate a balanced diet.
他喝咖啡和吸烟都比以前少了，饮食也均衡了。
