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    A2

    Inventions: The 'unsinkable' waterskis

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    林宜悉 posted on 2021/02/26
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    Video vocabulary

    boom

    US /bum/

    ・

    UK /bu:m/

    • Noun (Countable/Uncountable)
    • Very fast increase in growth or popularity
    • A very loud and deep sound
    • Intransitive Verb
    • To experience a rapid increase in growth
    • To make a very loud and deep sound
    B1
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