variable PI雯参数PIvariableadj.可变的；易变的n.变量；易变的东西variable guide变量向导variable field可变场,变场,可变字段,可变域,变量字段variable spray变量喷雾variable space变量空间variable width变宽度variable depth可变深度variable index标志变异指标variable array可变数组variable order可变指令variable ratio可变比,变率

1. The thesis compares the vaneless diffuser with the vane diffuser, and indicates that the vane diffuser is propitious to improve the fan performance.
   指出了斜流叶轮设置导向叶片扩压器有利于提高风机性能，因此在斜流风机中推荐使用叶片扩压器。