diameter例句
...a tube less than a fifth of the diameter of a human hair..…一根直径不到头发五分之一的微管。
diameter英语解释直径英释nna straight line from one side of a circle to the other side, passing through the centre of the circle, or the length of this line
diameter短语和解释particle diameter,粒径；颗粒直径，粒子直径.短语
