reactant
柯林斯词典
1. N a substance that participates in a chemical reaction, esp a substance that is present at the start of the reaction 反應物→compare product
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reactant /rɪˈæktənt/
剑桥词典
- a substance that is part of a chemical reaction
（化學反應中的）反應躰，反應物 返回 reactant