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重点讲解：
1.focus on 集中在…方面
例句：The study did not focus on whether the fungi had been a threat to human health.
该研究的焦点并非是这些真菌是否已对人类健康造成威胁。
2.over several years 在数年间...
例句：You'd be amazed at how helpful having a daily record like this can be, especially over several years.
你肯定会惊讶有这么一个日常记录会多么有用，尤其是经过几年以后。
3.link to 同…有联系；与…有牵连
例句：Much of that body of knowledge has no link to the financial crisis and remains as useful as ever.
经济学的大多数主体知识和金融危机没有关联，并依旧有用处。
4.at risk 有危险；在危险中
例句：But if your clinic would reassure me that I would not be at risk, then I would happily donate.
但是，如果诊所让我放心，保证我不会有危险，那么，我将愉快地捐赠。
