名词
1. Nitrogen forms about 78% of the earth\'s atmosphere.
氮约占地球大气的百分之七十八。
1. 氮;氮气
Nitrogen is a colourless element that has no smell and is usually found as a gas. It forms about 78% of the earth\'s atmosphere, and is found in all living things.
1. 氮;氮气
Nitrogen is a colourless element that has no smell and is usually found as a gas. It forms about 78% of the earth\'s atmosphere, and is found in all living things.
