名词
中文翻译：系数
同义词：
['factor', 'factorial', 'ratio例句：1. The coefficient of friction is a measure of how much force is needed to move an object.（摩擦系数是衡量移动物体所需的力的大小。）']
例句：
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1. The coefficient of friction is a measure of how much force is needed to move an object.
摩擦系数是衡量移动物体所需的力的大小。
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2. The coefficient of refraction is the speed at which light passes through a medium.
折射系数是光线通过介质的速度。
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3. The coefficient of thermal expansion is the change in length of a material when it is heated or cooled.
热膨胀系数是材料在加热或冷却时长度的变化。