名词
中文翻译：点函数
同义词：
['point function', 'direction function', 'directional function']
例句：
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1. The point function is used to calculate the distance between two points on a graph.
点函数用于计算图上两点之间的距离。
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2.In physics, the point function is often used to describe the behavior of particles at a specific point in space.
在物理学中，点函数常用来描述粒子在空间特定点的行为。
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3.The point function is essential for understanding the motion of objects in three-dimensional space.
点函数对于理解三维空间中物体的运动至关重要。