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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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    vast

    US /væst/

    ・

    UK /vɑ:st/

    • Adjective
    • Being very large in size or amount
    A2TOEIC
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    sustainable

    US /səˈsteɪnəbl/

    ・

    UK /səˈsteɪnəbl/

    • Adjective
    • Capable of continuing for a long time
    • Able to be maintained without running out of
    B2
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    inevitably

    US /ɪnˈevɪtəbli/

    ・

    UK /ɪnˈevɪtəbli/

    • Adverb
    • (Happening) with complete certainty
    B1
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