导率

例句：

1. 1. The speed of light is constant, regardless of the distance traveled.
   光速是恒定的，无论距离有多远。
2. 2. The efficiency of the machine is directly proportional to its size.
   机器的效率与其大小成正比。
3. 3. The graph shows the relationship between two variables, which can be used to calculatethe derivative.
   图表显示了两个变量之间的关系，可以用来计算导数。