plain text mode 明文方式
CBC is a mode of cryptographic operation in which the plain text data is divided into chunks of equally sized data blocks.
CBC是一种加密操作模式，其中纯文本数据分为同样大小的数据块。
For out-of-copyright books, the Google books team also made the plain text mode easier to find and read.
对于无版权的书，Google Books也做出了改进，使得纯文本内容更加容易发现、阅读。
Shredding and removing the original plain text event file ensures that no sensitive data remains on disk. Listing 13 shown below describes the decrypt mode
分解并删除原始的纯文本事件文件，确保磁盘上没有遗留敏感的数据。
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