variableareaadj.可变截面的variableadj.可变的；易变的n.变量；易变的东西variable gradient可变梯度variable deletion变量删除variable polarity变极性variable endpoint可变端点variable rigidity变刚度variable universe变论域variable constant可变常数variable quantity可变参量,变量,可变量variable friction变化摩擦力variable exchange[经] 可变汇率