variable pad可变衰减器variableadj.可变的；易变的n.变量；易变的东西variable separation分离变量variable area track变面积式声迹variable escapement可调擒纵机构variable dependency变量依赖variable state word变量状态字variable match unit变量匹配部件variable swept wing变后掠翼variable constraint可变约束variable modulation可变灯variable attenuator可变衰减器