balloon

uk

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/bəˈluːn/us

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/bəˈluːn/ A2 noun a small, very thin rubber bag that you blow air into or fill with a light gas until it is round in shape, used for decoration at parties or as a children's toy: We tied balloons and streamers to the ceiling ready for the party. 我们把气球和彩带系在顶棚上，晚会已布置妥当。