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1.fast food 快餐
例句：It's more convenient to eat in the fast food restaurant.
在快餐店就餐省事。
2.account for 导致；占...比例；解释
例句：How do you account for the difference between them?
你怎样解释他们之间的差异呢？
3.the proportion of 所占比例；比重
例句：The proportion of thermal energy increases rapidly with increasing temperature.
随着温度的上升，热能的比例迅速上升。
4.differs by 差别；差距
例句：His age differs by two years from your own.
他的年龄与你相差两岁。
