随着路上汽车越来越多，它也变得更加困难和成本不菲。
It becomes more difficult and costly with the ever-increasing number of cars on the roads.
然而，随着汽车越来越多，废气排放、空气污染问题变得更加严重。
However, with more and more waste gas being discharged by the cars, the problem of air pollution becomes even more serious.
然而，随着越来越多的废气排放是汽车、空气污染问题变得更加严重。
However, with more and more waste gas being discharged by the cars, the problem of air pollution bees even more serious.
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