汽油仍然含有铅，对人体有剧毒。
Gasoline still contains lead, which is extremely poisonous to humans.
在过去的20年里《空气洁净法案》要求在美国只能使用无铅汽油，因此世界范围内的铅沉积有了显著下降。
In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation world-wide has decreased significantly.
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