原因很简单：模型具有自己的继承层次结构。
The reason is simple: The module has an inheritance hierarchy of its own.
人们应该将自己继承的语言传递给孩子，主要原因有两个。
There are two major reasons people should pass their heritage language onto children.
由于优先级继承的原因，RTSJ需要使用优先级调整。
Because of priority inheritance, priority adjustments are required by the RTSJ.
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