It used to be a clear river but now it's getting dirtier and dirtier.

这曾经是一条清澈的小河，但现在变得越来越脏了。

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The sky is not so blue as before, water in the rivers is getting dirtier and dirtier, fishes are fewer than before.

天空是蓝色和以前一样，在河流的水越来越脏，鱼比以前少。

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Look! The water in the river is getting dirtier and dirtier. Most of fish in the water have died, and we cant swim in the water.

看！河流里的水变得越来越脏，脏。大多数的鱼在水里死了，我们不能在水里游泳。

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And it's a little dirtier.

有一点脏。

圣莫妮卡的海滩 - SpeakingMax英语口语达人

And the answer is a really dirty petroleum-based molecule, because the oil industry is getting dirtier and dirtier on the margins.

CNN: Ethanol: Is it friend or foe?

The glut exacerbates the inefficiency by forcing the utilities to rely on dirtier and less efficient sources of power to meet peak demand rather than simply redirecting surplus power from low demand to high-demand markets.

FORBES: The Answer To The Energy Problem

With that, the government watchdog agency is predicting that 15 percent to 24 percent of the current coal fleet will get retired by 2035, consisting almost exclusively of those older, dirtier and less efficient plants.

FORBES: A Wounded Coal Industry Seeks To Unseat A Rockefeller Who Turned On Them