barrage balloon
柯林斯词典
1. N one of a number of tethered balloons with cables or net suspended from them, used to deter low-flying air attack 防空气球; 一连串气球中的一个，气球上悬挂着缆绳或罗网，用来防止低空空袭
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1. N one of a number of tethered balloons with cables or net suspended from them, used to deter low-flying air attack 防空气球; 一连串气球中的一个，气球上悬挂着缆绳或罗网，用来防止低空空袭