含氮

hán dàn huà hé wù

含氮化合物

nitrogenous compound

fèn biàn hán dàn ér dàn kě yǐ féi huà huāng wú de tǔ di

粪便含氮，而氮可以肥化荒芜的土地。

The faeces contain nitrogen and it is that which fertilises the desert soil.