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    crucial

    US /ˈkruʃəl/

    UK /'kru:ʃl/

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

    US /ˈstrʌɡəl/

    UK /'strʌɡl/

    • Verb (Transitive/Intransitive)
    • To try very hard to do something difficult
    • To fight or struggle violently
    • Noun (Countable/Uncountable)
    • Strong efforts made to do something difficult
    • A difficult or challenging situation or task
    engage

    US /ɪn'gedʒ/

    UK /ɪn'ɡeɪdʒ/

    • Transitive Verb
    • To start to fight with an enemy
    • To hire someone for a task or job
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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
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