Music shops should arrange their recordings in simple alphabetical order, rather than by category.
音像店应按照简单的字母顺序摆放其唱片，而不是按类别。
For this shopping cart, there is a hierarchical Category class and a simple Product class.
对于这个购物车来说，有一个层次Category类和一个简单的product类。
Creating a new category is a relatively simple task.
创建一个新的类别是一项相对简单的任务。
Some carbs fall into the "starch" and "simple sugar" category.
一些碳水化合物落入“淀粉”和“简单的糖”一类。
Some carbs fall into the "starch" and "simple sugar" category.
一些碳水化合物落入“淀粉”和“简单的糖”一类。
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