Arco says 20% of West Coast drivers want leaded petrol.
阿科说20%的西岸司机要含铅汽油。
Lead deposits, which accumulated in soil and snow during the 1960s and '70s, were primarily the result of leaded gasoline emissions originating in the United States.
在二十世纪六七十年代,铅沉积就在土壤和雪中不断累积,这主要是美国的含铅汽油排放的后果。