为关键帧定义偏移量是可选的。

Defining offsets for key frames is optional.

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此种帧定义了不同的以太帧类型值。

Different Ethernet frame type values are defined for these frames.

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用来解析资源名称冲突的机制是：如果两个库jar文件都用相同的全局名称定义一个资源，那么则根据调用程序的堆栈帧来采用局部名称。

This mechanism is used to resolve resource-name conflicts: if two library JAR files define a resource with the same global name, the local names will be used based on the stack-frame of the caller.

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