It remains a question how we can get rid of pollution.

我们怎样才能消除污染，这仍然是个问题。

youdao

City people are, therefore, becoming more and more worried about how they can get rid of pollution.

因此，居住在城市的人对他们如何能消除污染也愈来愈担心。

youdao

City people are, therefore, becoming more and more worried about how they can get rid of pollution.

因此，居住在声调的人对他们如何能消除污染也愈来愈担心。

youdao