英语语法分析

Arsenicum is one of the necessary trace elements in the body, and plays roles in many aspects.

砷为机体所必需的微量元素，对机体有多方面的作用机制，同时大剂量情况下对机体将产生毒性作用。

Objective To investigate the effect of electrochemical therapy on arsenicum-induced skin cancer.

目的探讨使用电化学治疗砷致皮肤癌的临床疗效。

Introduces meaning and problems to need attention while arsenicum contents in coal is determined.

本文介绍了煤中砷测定的意义以及测定时应注意的问题。