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1.contact lenses 隐形眼镜
例句：So contact lenses are really comfortable to wear.
隐形眼镜戴上去也很舒服。
2.the proportion of ...的比例
例句：What is the proportion of men to women in the population?
人口中男女的比例是多少？
3.on average 平均，普通，通常
例句：We fail one student per year on average.
我们平均每年有一个学生不及格。
4.compare with 与...相比较，比较
例句：He cannot compare with Shakespeare as a writer of tragedies.
作为一个悲剧作家,他无法与莎士比亚相比。
