1·The axis of a circle is its diameter.
圆的对称中心线就是直径。
—— 《牛津词典》
2·It turns out that the diameter is actually 2.5 centimeters.
它的直径实际上是 2.5 厘米。
3·The microscope can magnify the object 100 times in diameter.
这架显微镜能把物体的直径放大100倍。
4·Nanocrystals, also known as quantum dots, are semiconducting particles with a diameter of a few millionths of a millimeter.
纳米晶体,也被称为量子点,是一种直径只有百万分之一毫米的半导体粒子。
5·It is mainly composed of a steel rectangular parallelepiped and two steel cylinders of the same diameter fixed at its two ends.
它主要由一钢制长方体和固定在其两端的两个相同直径的钢制圆柱体组成。