nitrogen
柯林斯词典
1. N-UNCOUNT Nitrogen is a colourless element that has no smell and is usually found as a gas. It forms about 78 percent of the Earth's atmosphere, and is found in all living things. 氮
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nitrogen /ˈnaɪtrədʒən/
剑桥词典
- a chemical element that is a gas with no colour or taste , forms most of the earth's atmosphere , and is a part of all living things
氮（气） 返回 nitrogen