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。
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？
When size of second declared array is 2, it gets extra 4 byte offset.
当尺寸二声明数组是2，得到额外的4字节的偏移量。
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