variable arm可变臂[见于tRNA]variableadj.可变的；易变的n.变量；易变的东西variable stator blade可调导叶variable region group可变区群variable equalization变量均衡Variable tap-length变抽头长度variable intake swirl可调进气涡流variable value control跟踪控制variable speed reducer[化] 变速减速机variable frequency TMD变频单TMDvariable capacity pump可调流量泵,变量泵variable density track变密度式声迹