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重点讲解：
1. at risk 处境危险；有风险的；在危险；
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。
2. be sure of 确信的；确知的；
I hope you are sure of your facts.
我希望你能肯定你说的都是事实。
3. object to 不喜欢；不赞成；反对；
Many local people object to the building of the new airport.
许多当地的居民反对兴建新机场。
4. no longer 不再；已不；
Food shortages are no longer a problem.
食物短缺不再是个问题。
