大气中含有70%以上的氮气.The atmosphere consist of more than 70 % of nitrogen.这只是对威尔逊氮气云室的一种改进.It was an adaptation of Wilson's cloud chamber, filled with nitrogen gas.采气管得用氮气吹扫.Sample gas tubes are flushed with nitrogen....

“氮气”的英语可以翻译为：nitrogen ...