柯林斯詞典tuba /?tju?b?/ (tubas) 1. N-VAR A tuba is a large musical instrument of the brass family which produces very low notes. It consists of a long metal tube folded around several times with a wide opening at the end. 大號[oft 'the' N] 返回 tuba劍橋詞典a brass musical instrument consisting of a long , bent metal tube that the player blows into, producing low notes 大號（一種低音銅管樂器） 返回 tuba