Diameter
01
直径, 直径
a straight line from one side of a round object, particularly a circle, passing through the center and joining the other side
例子
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
a unit of linear measurement used to express magnifying power
例子
Telescopes are often rated in diameters.
词汇树
diametral
diametrical
semidiameter
diameter
