variable arm可变臂[见于tRNA]variableadj.可变的；易变的n.变量；易变的东西variable transmission变速传动variable deceleration变异减速variable power factor可变功率因数variable pointer list可变指针表variable expressivity表现变异性variable sensityivity可变灵敏度variable power system变焦度系统variable thresholding可变阈值variable line element可变线元variable density film可变密度胶片