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.

无可否认，空气污染是一个极其严重的问题：城市当局应该采取有力措施来解决它。

These days, people in growing numbers are beginning to complain that work is more stressful and

less leisurely than in past. Many experts point out that, along with the development of modern