| 释义 |
〔angular〕Measured by an angle or by degrees of an arc.用角测量的,用弧度测量的〔radian〕A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17′44.6". See table at measurement 弧度:平面角的一种衡量单位,其大小为长度等于半径的弧对的圆心角,1弧度角约等于57°17′44.6" 参见 measurement〔level〕Flat applies to surfaces without curves, protuberances, or indentations: Flat 指的是没有弧度、隆起或凹陷的表面: |