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    crucial

    US /ˈkruʃəl/

    ・

    UK /'kru:ʃl/

    • Adjective
    • Extremely important or necessary
    • Of great importance to the success of something.
    B1
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    simultaneously

    US /saɪməlˈtenɪəslɪ/

    ・

    UK /ˌsɪməl'teɪnɪəslɪ/

    • Adverb
    • At the same time; all together
    B2
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    basically

    US /ˈbesɪkəli,-kli/

    ・

    UK /ˈbeɪsɪkli/

    • Adverb
    • Used before you explain something simply, clearly
    • In essence; when you consider the most important aspects of something.
    A2
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    infrastructure

    US /ˈɪnfrəˌstrʌktʃɚ/

    ・

    UK /'ɪnfrəstrʌktʃə(r)/

    • Uncountable Noun
    • Basic necessary equipment for a country or region
    • The underlying framework or system of an organization.
    B1
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