variable vane可调导向叶片variableadj.可变的；易变的n.变量；易变的东西variable-sequence robot可变顺序机器人variable duration impulse可调宽度脉冲variable-gain amplifier变增益放大器variable fluid-property变物性variable color polarizing可变色偏振variable speed controller变速控制器variable immunodeficiency多样性免疫缺陷variable time step method变时步法variable discharge permit变量排污许可证variable-rate sprinkler变量喷头