密码：一种密码系统，其中固定长度的明文里的单元，通常为字母，被任意倒置或按事先确定的符号系统替换。
A cryptographic system in which units of plain text of regular length, usually letters, are arbitrarily transposed or substituted according to a predetermined code.
通过将分组数据分段成预定长度的单元而产生基本单元，并产生用于每个基本单元的基本单元信息。
A basic unit is generated by segmenting packet data into units of a predetermined size and generates basic unit information for each basic unit.
自动络纱机的卷绕单元（10）构成为能够将规定长度的纱线卷 绕到卷装（30）上。
A winding unit 10 in an automatic winder is configured to wind a predetermined length of yarn 20 into a package 30.
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