This radioactive form of nitrogen does not occur in nature .

氮的这种放射性形式在自然界中不会产生。

Nitrogen and argon gas are popular choices for wine preservation .

氮气和氩气是保存葡萄酒时的常用选择。

Agriculture 's third basic input is nitrogen .

农业的第三个要素就是氮。

Shell uses nitrogen enriched gasoline to help keep engine parts clean .

壳牌销售加氮汽油，以保持发动机零件干净。

Electric power plants that burn fossil fuels release hydrocarbons and nitrogen oxides .

通过燃烧矿物发电的火力发电厂会释放碳氢化合物和氮氧化物。