中国学生每年购买28亿本新教材。
Students across China buy 2,800 million new textbooks every year.
根据这项法案，所有16周岁及以上的水禽狩猎者必须每年购买并持有一枚联邦鸭票。
Under this Act, all waterfowl hunters 16 years of age and over must annually purchase and carry a Federal Duck Stamp.
每年购买产品的平均值展示在表二中。
Mean values for the products purchased in each year are presented in table 2.
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