名词
中文翻译：半径向量
同义词：
['radial vector', 'radius vector']
例句：
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1.The graph shows the distribution of the population in the city.
该图显示了城市人口的分布情况。
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2. The scientist used a radial vector to measure the distance between two points.
科学家使用一个径向向量来测量两点之间的距离。
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3. The radial vector is perpendicular to the plane of the circle.
径向向量与圆的平面垂直。