A straight line from the center of a circle or sphere to the circumference or surface.

半径(abbr. r.)。

Circular area defined by a radius.

以半径画成之圆形面积。

Limit of travel without refueling, as of a boat or plane.

行动范围(指船或飞机无需加添燃料之情况)。

The shorter bone of the forearm, on the thumb side.

【解】桡骨。