barrage balloon
noun [ C ] uk/ˈbær.ɑːʒ bəˌluːn/ us/bəˈrɑːʒ bəˌluːn/
(阻止敌机低飞的)阻塞气球
a large balloon, especially one of a group that is tied to the ground with metal ropes in order to stop enemy aircraft that are flying low
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