From the teaching perspective, this article firstly points out definitions of culture and cross-culture, revealing the close relations between culture and language.
文章从教学的角度，首先指出了文化和跨文化的定义，形象地说明了语言和文化之间的紧密联系；
This article firstly introduces the basic knowledge of cryptology involved.
本文首先对文中涉及的密码学的基础知识进行了介绍。
This article firstly describes these technologies and new changes, and then analyzes some key technology issues.
本文首先介绍这些新技术和新变化，并重点就一些关键技术问题进行分析。
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