And if that wasn t bad enough NOx is a poisonous pollutant that it takes a lot of effort to remove.

而且，比这更糟的是，氮氧化物属于一种有毒的污染物，清除它需要付出很高的成本。

youdao

And if that wasn t bad enough NOx is a poisonous pollutant that it takes a lot of effort to remove.

而且，比这更糟的是，氮氧化物属于一种有毒的污染物，清除它需要付出很高的成本。

youdao