a straight line passing from side to side through the centre of a body or figure, especially a circle or sphere
(尤指圆或球体的)直径。
the length of this line
直径长。
a transverse measurement of something; width or thickness.
横度;宽度;厚度。
a unit of linear measurement of magnifying power
放大倍数。
"late Middle English: from Old French diametre, via Latin from Greek