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重点讲解：
1. in an effort to 为了完成；努力；
I spent much of my time bundled up in sweaters in an effort to keep warm.
大部分时间里我都穿着厚厚的毛衣来保暖。
2. on campus 在校园；在校园里；
Private automobiles are not allowed on campus.
大学校园不许私人汽车入内。
3. make sure 尽力做到；确保；
You have to make sure you're comparing like with like.
你必须确保是在进行同类比较。
4. result in 导致；结果是；
Food allergies can result in an enormous variety of different symptoms.
食物过敏会引发很多不同的症状。
