Whereas the other three piles were dead, dark and stinky, and the PAH's -- the aromatic hydrocarbons -- went from 10,000 parts per million to less than 200 in eight weeks.
而其它三堆绒布死了，变黑变臭了， PAH——芳香族碳氢化合物—— 在8周的时间里从每百万10,000份减少至每百万200份。