coefficient of passengers travelling by trains

例句：

1. 1.The coefficient of friction is a measure of how easily two surfaces can slide over each other.
   摩擦系数是衡量两个表面滑动难易程度的指标。
2. 2. In physics, the coefficient of refraction determines how light bends when it passes through a medium with different refractive indices.
   在物理学中，折射率系数决定了光线通过具有不同折射指数介质时发生弯曲的程度。
3. 3. The coefficient of thermal conductivity is used to calculate the rate at which heat energy transfersfrom one object to another.
   热导率系数用于计算热量从一种物体传递到另一种物体的速度。