Are you familiar with the visas of main countries in the world?
你有兴趣了解世界上一些主要国家的签证是什么样吗？
Ancient Egypt and Greece were two main countries in the world ancient history, and they both possessed superior geographical conditions.
上古埃及和希腊是世界古代史上的两个主要国家，都具有独特的地理环境。
The plastics output of main countries in the world, the synthesis of resin, the application and development of plastics product and the new grades of resins introduced in greater detail.
提供了各主要生产国的塑料产量。对树脂合成工艺、产品应用开发、树脂品种延伸等作了较详细的介绍。
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