adj.双的，两部分的，二体的，二重的 n.双数,双数词
his dual role as composer and conductor
他兼任作曲家和指挥的双重角色
He has dual role as composer and conductor.
他兼作曲家及指挥的双重身分.
The airplane had dual controls.
这架飞机有两套操纵装置.