a large aircraft without wings, used especially in the past, consisting of a large bag filled with gas that is lighter than air and driven by engines. Passengers were carried in a structure hanging below.(软式)飞艇(尤在旧时使用的大型飞行器,艇身为充满轻于空气气体的气囊,由发动机提供动力,下部为封闭的载人吊舱)
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