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1·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？”

2·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。

3·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。

4·Objective: To observe clinical therapeutic effective of 5 mono nitre isosorbide combined with ginkgo leaf in the treatment of angina pectoris.

目的：比较5 单硝异山梨醇酯和银杏叶并用与单用5 单硝异山梨醇酯对心绞痛患者的疗效。