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重点讲解：
1. come from 来自；
Help may also come from some unexpected places.
帮助也可能来自某些意想不到的地方。
2. at risk 处境危险；有风险的；在危险中；
As with all diseases, certain groups will be more at risk than others.
所有的疾病都是如此，一些人比另一些人更容易受到威胁。
3. mistake for 搞错；把…误认为；把…错当成；
I mistook you for Carlos.
我把你错当成卡洛斯了。
4. as a result 结果；后果；
He made one big mistake, and, as a result, lost his job.
他犯了个大错，结果丢了工作。
