Nitrify
vt. 使與氮化合, 用氮飽和, 硝化
??? 情景例句
The young couple started a family.
這對年輕的夫婦組成了一個家庭。
I have great difficulty in understanding him.
我覺得很難理解他。
Many firms, for instance, have great difficulty in obtaining technical or scientific books from libraries
比如，很多公司向圖書館借閱科技書籍時感到很困難，