dimensionless number meaning in Chinese

无量纲数
无量纲值
无因次数
无因次值
准数

The physical meaning of dimensionless numbers cannot usually be formulated clearly .
无因次数的物体意义一般不能清楚地用公式表达。
Dimensionless numbers may result either from counting or from taking the ratio of two quantities expressed in the same unit of measurement .
无量纲的数，或者由计数而得，或者由求两个采用同一计量单位的量之比率而得。
What good are dimensions then , if we really measure dimensionless numbers
既然我们测量的是无量纲的数字，那量纲有什么用呢？