1·Any two diameters of a circle intersect each other.
圆周内两直径必相交。
—— 《新英汉大辞典》
2·The shot now crosses the goal line 0.030 seconds (or more than 2 ball diameters) ahead of its equivalent at sea level.
而这记射门比它在海平面时一样的情况快0.030秒（或者是多过2个足球直径）。
3·Their diameters are about the same as Jupiter's, but they can have up to 80 times more mass and are thought to have planetary systems of their own.
它们的直径和木星的一样，不过质量比木星质量的80倍还大。它们被认为是拥有自己的行星系统。
4·Not the radii but I will give you the diameters of these ball bearings.
不是半径，而是这些滚珠的直径。
5·On turning different materials and works of different diameters, lathes must be run at different speeds.
在切削不同的直径不同的材料和工作时，车床必须以不同的速度加工。