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Diameter
01
直径, 直线直径
a straight line from one side of a round object, particularly a circle, passing through the center and joining the other side
Example
The diameter of a circle is the longest distance between any two points on its circumference, passing through the center.
一个圆的直径是圆周上任意两点之间的最远距离，经过圆心。,一个圆的直线直径是圆周上任意两点之间的最远距离，经过圆心。
To calculate the circumference of a circle, you need to know its diameter and use the formula π × diameter.
要计算圆的周长，你需要知道它的直径，并使用公式 π × 直径。
02
直径, 直线直径
a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)
