diameter
n. 直径；放大倍数
复数 diameters
例句
The dome is 42.3 metres in diameter.
这个穹顶直径为42.3米。
《牛津词典》
The axis of a circle is its diameter.
圆的对称中心线就是直径。
It turns out that the diameter is actually 2.5 centimeters.
它的直径实际上是 2.5 厘米。
