Store the resulting value in one extra byte at the end of the file.

将得到的值存储到文件尾部的一个额外字节中。

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A check bit is an extra bit attached to the end of a byte for purposes of checking for accuracy.

校验位是附在字节最后的一个额外的位，其目的是为了检验其精确性。

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If all the applications are available on your network, why lug around a 1g-byte hard disk and extra batteries?

如果所有的应用程序能从网络上得到，为什么还要到处移动1千兆字节的硬盘和额外的电池呢？

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