英语语法分析

Pyritum and some compounds with pyritum have many curative effects. It is for oral and external use.

但是自然铜常以未溶解状态的粗糙矿物原粉入药，造成用量大、有效成分难溶解等问题。

Objective To investigate the changes of microelement in curde and calcined pyritum, and approach the process mechanism of pyritum.

高婵，李伟东，李俊松，丁霞，蔡宝昌【摘要】 目的考察自然铜炮制前后微量元素的含量变化，以探讨自然铜炮制机理。