Only with combined effort can we solve the problem of environmental pollution.
只有共同努力，我们才能解决环境污染的问题。
Now environmental pollution has become a very serious problem the world is facing today.
现在环境污染已经成为当今世界面临的一个非常严重的问题。
Environmental pollution has been a problem facing mankind today.
环境污染是当今人们所面临的一个非常严重的问题。
Recently, the problem of environmental pollution is getting more and more serious.
近年来，环境污染问题越来越严重。
The environmental pollution has become an important problem that the world has to be faced.
环境污染已成为当今世界所面临的一个重要问题。
More serious was the problem of environmental pollution.
更为严重的是环境污染问题。
Environmental pollution is the world's biggest problem.
环境污染是当今世界上最大的问题。
Environmental pollution is the world's biggest problem.
环境污染是当今世界上最大的问题。
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