There is no denying that piracy is an extremely serious problem.

无可否认，盗版是一个极其严重的问题。

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There is no denying the fact that air pollution is an extremely serious problem and we should take strong measures to deal with it.

不可否认， 空气污染是一个极其严重的问题， 我们应该采取有力措施来解决它。

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There is no denying the fact that air pollution is an extremely serious problem: the city authorities should take strong measures to deal with it.

不可否认，空气污染是一个极其严重的问题：市政部门应该采取有力措施来解决。

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