英语语法分析

"Nitre," I replied. "How long have you had that cough?"

“硝，”我答道，“你害上那种咳嗽有多久了？”

They used lumps of nitre, a sodium compound from the ship.

他们使用了船上的硝石块-钠的一种化合物。

The harm of nitrate to human being and the source from where human being absorb nitre were discussed.

论述了硝酸盐对人体的危害，人体硝酸盐来源及主要城市蔬菜硝酸盐污染现状。