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BNC: 10511 COCA: 11513
reactive
adjective /riˈæktɪv/
  1. 1
    reacting to things that happen, rather than making things happen yourself 作出反应的

    We take a proactive rather than a reactive approach.

     Synonyms and related words
  2. 2
    chemistry a reactive substance experiences a chemical reaction when it is mixed with another substance (物质)能起化学作用的
     Synonyms and related words
    Describing chemicals and chemical processes: active, aerobic, alkaline...

derived word

reactivity

/ˌriːækˈtɪvəti/ noun [U]
 Synonyms and related words
Chemical reactions and processes: action, adsorb, aerate...
 Synonyms and related words

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