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    constantly

    US /ˈkɑnstəntlɪ/

    ・

    UK /ˈkɒnstəntli/

    • Adverb
    • Frequently, or without pause
    • In a way that is unchanging or faithful
    B1
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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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    doubt

    US /daʊt/

    ・

    UK /daʊt/

    • Noun (Countable/Uncountable)
    • Not being sure of something; lack of certainty
    • A possibility that something is not as it appears or is stated to be.
    • Verb (Transitive/Intransitive)
    • To question the truth or certainty of something
    A1TOEIC
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    drastically

    US /ˈdræstɪkl:ɪ/

    ・

    UK /'drɑ:stɪklɪ/

    • Adverb
    • In a sudden, extreme or severe manner
    B2TOEIC
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