看一看Wikipedia, the free encyclopedia, 什么是“化学物质”(Chemical substances):
In chemistry, a chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e. without breaking chemical bonds. They can be solids, liquids or gases.
看一看Wikipedia, the free encyclopedia对药品(drug)的定义:
In pharmacology, a drug is a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well-being.