nitrogen [ˈnaɪtrədʒən]以下由轻松背单词网站提供
单词级别第5级基本释义n.[化]氮英英释义a gas with no colour or taste which forms about 78% of the Earth's atmosphere and is a part of all things which live参考例句The atmosphere consist of more than 70% of nitrogen. 大气中含有70%以上的氮气。What is the percentage of nitrogen in air? 空气中所含的氮的比例是多少? 推荐阅读 |