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    crucial

    US /ˈkruʃəl/

    UK /'kru:ʃl/

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

    US /ˈkrɑnɪk/

    UK /'krɒnɪk/

    • Adjective
    • Always or often doing something, e.g. lying
    • (Of disease) over a long time; serious
    essential

    US /ɪˈsɛnʃəl/

    UK /ɪ'senʃl/

    • Adjective
    • Extremely or most important and necessary
    • Fundamental; basic.
    • Noun
    • A concentrated hydrophobic liquid containing volatile aroma compounds from plants.
    B1TOEIC
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    immune

    US /ɪˈmjoon/

    UK /ɪˈmju:n/

    • Adjective
    • Having a special protection from, e.g. the law
    • Protected against a particular disease or condition because of antibodies or vaccination.
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