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重点讲解：
1. filter out 滤除；滤掉；
Children should have glasses which filter out UV rays.
儿童应该戴上滤除紫外线的眼镜。
2. suffer from (因疾病或处于其他不利境地而)受苦，受难，受折磨；
They suffer from health problems and fear the long term effects of radiation
他们遭受着健康问题的困扰并且害怕辐射的长期影响。
3. wipe out 摧毁；毁灭；使灭绝；
Of course, in the event of a disaster big enough to wipe out all humans, such as a colossal asteroid strike, it would not really matter.
当然，万一遭到一次足以毁灭全人类的灾难，例如行星撞地球，这个问题将会无关紧要。
4. be sure of 一定的；必定的；无疑的；确保的；
One thing I am sure of was that she was scared.
有一点我能肯定，那就是她当时被吓到了。
