| 释义 |
diameter/daiˈæmitə/n. 1a a straight line passing from side to side through the centre of a body or figure, esp. a circle or sphere 直径(尤指穿过圆心或球心的直线) b the length of this line 直径长度 2 a transverse measurement; width, thickness 横向量；宽度；厚度 3 a unit of linear measurement of magnifying power 放大率(线性单位) a lens magnifying 2,000 diameters 放大率为 2,000 倍的透镜 □ diametral adj.[Middle English via Old French diametre and Latin diametrus from Greek diametros (grammē) ‘(line) measuring across’, from metron ‘measure’] |