最后一个片段有一个非零的片段偏移字段，将它与未碎片化的包区分开。

The last fragment has a non-zero Fragment Offset field, differentiating it from an unfragmented packet.

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在String构造函数运行之前，Object的构造函数将用它们默认的值初始化所有字段，包括决定性的长度和偏移字段。

Before the String constructor runs, the constructor for Object will initialize all fields, including the final length and offset fields, with their default values.

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应用程序必须知道每个字段的次序和类型，因为它必须计算该字段在记录中的偏移量。

The application must know the order and type of each field since it must calculate its offset in the record.

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