reagent

名词 reagent:

1. a chemical agent for use in chemical reactions

1. He mixed the two reagents, though I had told him not to.
   他把这两种试剂混起来了，虽然我曾告诉他不要混起来。

re.a.gent

n.（名词）
A substance used in a chemical reaction to detect, measure, examine, or produce other substances.
试剂：在化学反应中用到的一种物质，其作用是探测、测量、检查或产生其它物质