-
A drug is a chemical substance.
毒品是一种化学物质。
youdao
-
The purification of a substance by exposure to the mechanical or chemical action of air.
物质暴露于空气中，通过机械作用或化学反应使其纯化。
youdao
-
Is the substance a simple one, or a chemical compound?
物质是单质还是化合物？
youdao
-
Is the substance a simple one, or a chemical compound?
物质是单质还是化合物？
youdao