Such laws in California have cut diesel-soot emissions in that state by half.

在加州，这样的法律已削减该州一半柴油碳烟的排放。

youdao

Such laws in California have cut diesel-soot emissions in that state by half.

在加州，这样的法律已削减该州一半柴油碳烟的排放。

youdao