Carcinogenic dyes and those having carcinogenic risk in various kinds of dyes in common use are discussed in detail.

详细地介绍了常用各大类染料中的致癌及可能致癌染料品种。

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The encryption and decryption procedure of PGP is studied in detail and its security is briefly presented. Finally, the way to use PGP in common Email software to protect Email is analysed.

首先介绍了互联网上加密电子邮件的新软件——PGP，具体分析了用PGP加、解密电子邮件的详细过程，并简单讨论了PGP的安全性能，最后分析了目前最常用的电子邮件上的PGP加密功能。

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In this paper, video encoding techniques in common use and the major standards of video encoding are presented in detail.

文章详细介绍了常用的视频编码技术，并对当前的一些视频编码标准作了较详细的介绍。

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