This action keeps the By Category view the same to the user.
此动作使ByCategory视图能对用户保持不变。
Expect to see few (if any) user defined classes fall into this category.
期望越少(如果有的话)的用户定义类落入此种境地。
The label is how the category appears to the user.
标签是用户所看到的类别名称。
The label is how the category appears to the user.
标签是用户所看到的类别名称。
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