无可否认，空气污染是一个极其严重的问题 meaning in English
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
Examples
- There is no denying the fact that air pollution is an extremely serious problem : we should take strong measures to deal with it
无可否认，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。