He always picked the hardest and dirtiest jobs.

他总是挑最脏最累的活干。

《新英汉大辞典》

But coal is also seen as the dirtiest fuel.

但是煤炭也被看作最肮脏的燃料。

youdao

I wouldn't say Stockton was the dirtiest player in the league.

我不认为斯托克顿是联盟最脏的球员。

youdao

The Southern Company, based in Atlanta, Georgia, is the dirtiest power plant, according to the report.

CNN: Nature - America's most wanted: Power plants urged to clean up their act

Dr Nagpaul said eight out of 10 of "Britain's dirtiest hospitals" employed private sector cleaners.

BBC: Private sector 'detrimental to NHS'

However, that progress is uneven, and the dirtiest plants continue to churn out thousands of pounds of toxins.

FORBES: Coal Plants Belching Out Less Mercury