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    crisis

    US /ˈkraɪsɪs/

    UK /'kraɪsɪs/

    • Noun (Countable/Uncountable)
    • Unstable situation of extreme danger or difficulty
    • A turning point in a disease.
    effective

    US /ɪˈfɛktɪv/

    UK /ɪˈfektɪv/

    • Adjective
    • Working efficiently to produce a desired result
    • In operation; in force.
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    force

    US /fɔrs, fors/

    UK /fɔ:s/

    • Noun
    • Group of persons trained for military action; army
    • Pressure; attraction
    • Transitive Verb
    • To use physical strength or violence to persuade
    • To break open (something) using force.
    vaccine

    US /vækˈsin,ˈvækˌsin/

    UK /'væksi:n/

    • Noun (Countable/Uncountable)
    • Shot using weak disease cells to stop same disease
    • A preparation of weakened or killed microorganisms, or of antigenic proteins derived from them, used to induce protective immunity in animals.
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