The block length is always 512 bytes.
该块的长度总是512字节。
A set block length of less than 512 bytes will cause a write error.
设定块的的长度小于512字节将会导致写入错误。
A block with a length that can be established by a programmer.
其长度可由程序员指定的一种数据块。
In this context a message is an entire block of data, of arbitrary length.
在这方面，一消息是整个数据块的任意长度。
In this context a message is an entire block of data, of arbitrary length.
在这方面，一消息是整个数据块的任意长度。
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