In their model, the radius is the distance from the center of the animal to its skin.

在他们的模型中，半径是动物中心到其皮肤的距离。

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A circle is just a big point: in addition to the center coordinates it needs a radius.

圆本身就是一个很大的点：除了一个中心点坐标，其还需要一个半径来表示。

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The Angle subtended at the center of a sphere by an area on its surface numerically equal to the square of the radius.

在单位半径的球体中心对球表面上的投影面积所张的角。

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Dealers located within a 50-mile radius of a major urban center were found to offer lower prices on equivalent models than their counterparts located in distant suburbs and rural areas in nearly all U.S. states.

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