The problem with parking lots is that they accumulate a lot of pollutants - oil, grease, heavy metals and sediment - that cannot be absorbed by the surface, " Engel said."

他说：「停车场的问题出在，它累积了很多污染物，如汽油、油污、重金属及沉积物，它们并不会被地表吸收。」

youdao

With parking revenue in excess of $1 million a year, its streets receive biweekly steam-cleaning.

停车费收入每年超过1百万美元，该区的街道得以享用两周一次蒸汽清洁服务。

youdao

With parking revenue in excess of $1 million a year, its streets receive biweekly steam-cleaning.

停车费收入每年超过1百万美元，该区的街道得以享用两周一次蒸汽清洁服务。

youdao