英语翻译要用到：play a role，

Undoubtedly China is playing an increasingly important role in international affairs.

Without doubt, China is playing a more and more important role in International affairs.

Undoubtedly, China is playing a more and more important role in the international affairs.

China has undoubtedly played an increasingly important role in international affairs.

中学常规的手工翻译如下：
There is no doubt that China is playing a more and more important role in international affairs.
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