variable arm可变臂[见于tRNA]variableadj.可变的；易变的n.变量；易变的东西variable-mu tetrode变μ四极管, 可变放大系数四极电子管variable-power lens可变放大率透镜variable charge soils可变电荷土壤variable section pile变颈桩variable allele model可变等位基因模型variable PI parameter变PI参数variable valve timing可变气门正时variable-area track可变面积声槽,面积调制声道variable-size block可变长块variable pitch spring不等螺距弹簧