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    tough

    US /tʌf/

    UK /tʌf/

    • Adjective
    • (Of food) difficult to chew or bite through
    • Very difficult to do or deal with
    • Noun
    • A rough and aggressive person.
    concept

    US /ˈkɑnˌsɛpt/

    UK /'kɒnsept/

    • Noun (Countable/Uncountable)
    • Abstract idea of something or how it works
    • A plan or intention; a conception.
    A2TOEIC
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    constant

    US /ˈkɑnstənt/

    UK /'kɒnstənt/

    • Adjective
    • Happening frequently or without pause
    • Remaining the same over time or not changing.
    • Noun
    • Thing that happens always or at a regular rate
    • A physical quantity that is believed to have a fixed value and is used in calculations.
    A2TOEIC
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    vast

    US /væst/

    UK /vɑ:st/

    • Adjective
    • Being very large in size or amount
    A2TOEIC
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