The data pointer value is not valid.
数据指针值无效。
The data pointer will now contain the pointer to that label each time the callback is called.
现在每次调用回调时，data指针都会包含到那个标签的指针。
The semantic cache consists of disjoint semantic regions, and each semantic region includes a description and a corresponding data pointer.
语义缓存由互不相交的语义区域组成，每一个语义区域包括语义描述及其数据指针。
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