reagent
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/riˈeɪdʒənt/
🇬🇧
/riˈeɪdʒənt/
A substance used to test or cause a chemical reaction, often to identify another substance.
The chemist added a few drops of reagent to the mixture to see if it would change color.
化学者は、混合物に数滴の試薬を加え、それが色を変えるかどうかを確かめるために色を変える。