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    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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    content

    US /ˈkɑnˌtɛnt/

    ・

    UK /'kɒntent/

    • Adjective
    • Being happy or satisfied
    • In a state of peaceful happiness.
    • Noun (Countable/Uncountable)
    • Information in something, e.g. book or computer
    • The subject matter of a book, speech, etc.
    A2
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    vital

    US /'vaɪtl/

    ・

    UK /'vaɪtl/

    • Adjective
    • Needed to support life; essential
    • Full of life; energetic
    B1TOEIC
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    insane

    US /ɪnˈsen/

    ・

    UK /ɪnˈseɪn/

    • Adjective
    • Mentally ill; crazy
    • Being crazy or stupid
    B2
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