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重点讲解：
1.attribute to 归因于；把…归因于；归咎于
例句：The former she hoped at last might have been accidental, and the latter she could only attribute to her own stupidity.
对于前者，她最终希望或许是偶然现象，对于后者，她只能归咎于她自己太愚钝。
2.take up to 需要
例句：However, any agreement could take up to a year to finalise.
然而，最终敲定协议可能需要一年时间。
3.be beneficial to 对…有益；有利于；对…有利
例句：Advertising can be beneficial to the customers if it is true to its claims.
广告如果名副其实，对消费者是有益的。
4.expand on 详述；阐述；细说
例句：I'll expand on this problem at the next meeting.
我将在下次会议上详谈这个问题。
