提供者包含许多类别，它们是松散地组织的规则或其他类别。
Providers contain categories, which are loose organizations of rules or other categories.
这样，分类法就拥有了一个根类别，它可以是其他许多类别的父类别。
The taxonomy then holds a root category, which can be the parent of a number of other categories. So from the top-down, this is how OmniFind 8.2.1 appears to the connector developer.
MFC提供许多类别，这些类别允许执行绪同步物件的存取，以维护执行绪安全性。
MFC provides a number of classes that allow threads to synchronize access to objects to maintain thread safety.
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