直径

The diameter of the Earth at the equator is about 12,742 kilometers.
地球在赤道的直径大约为12,742公里。
We measured the diameter of the tree trunk to estimate its age.
我们测量了树干的直径来估算它的年龄。
The diameter of the moon appears smaller than that of the sun because it's farther away from us.
月球的直径看起来比太阳小，因为它离我们更远。
To calculate the volume of a cylinder, you need to know its height and diameter.
要计算圆柱体的体积，你需要知道它的高度和直径。
The diameter of a circle is twice its radius.
圆的直径是其半径的两倍。
The telescope has a lens with a diameter of 10 inches.
这台望远镜有一个直径为10英寸的透镜。
The diameter of a molecule is too small to be seen with the naked eye.
分子的直径太小，肉眼无法看到。
In geometry, the diameter of a circle is defined as the longest chord of the circle.
在几何学中，圆的直径被定义为圆中最长的弦。
The tunnel's diameter was increased to accommodate larger trains.
隧道的直径被扩大以容纳更大的火车。
The engineer used a micrometer to measure the diameter of the rod accurately.
工程师使用千分尺准确地测量了杆的直径。