In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.
在《清洁空气法案》强制要求美国使用无铅气体的二十年里，铅在世界范围内的累积量显著下降。
2
Lead weights and air cylinders encumbered the divers as they walked to the shore.
当潜水员们走向海岸时，铅坠和氧气缸让他们步履维艰。
《柯林斯英汉双解大词典》
3
Lead in air, mercury in food and other chemicals can result in long-term, often irreversible effects, such as infertility, miscarriage, and birth defects.