空气污染越来越成为问题
air pollution is becoming increasingly problematic.
人口老龄化越来越成为社会的问题
An ageing population is becoming more and more of a problem for modern society.
The air pollution is becoming more of a question
air polluting is becoming more than a problem.
[A] becomes a problem of [B] more and more.
XXX is more and more prblematic.
XXX=空气污染之类,即LZ的...
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