derivative-action coefficient

例句：

1. 1. The coefficientof friction between the two materials is crucial for understanding their interaction.
   两种材料之间的摩擦系数对于理解它们之间的相互作用至关重要。
2. 2.In physics, the coefficient of thermal expansion is a measure of how much a material expands when it's heated or cooled.
   在物理学中，热膨胀系数是衡量材料加热或冷却时膨胀程度的指标。
3. 3. The coefficient of determination is used to quantify the amount of variance in a dataset that can be explained by a model.
   决定系数用于量化数据集中的变异量，这些变异量可以通过模型来解释。