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aqualung

noun
🔊/ˈækwəlʌŋ/
🔊/ˈɑːkwəlʌŋ/
(US English also Aqualung™)
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  1. a piece of breathing equipment that a diver wears on his/her back when swimming underwater轻便潜水器；水肺Topics Sports: water sportsc2
    Word Origin1950s (originally a proprietary name in the US): from Latin aqua ‘water’ + lung.