汉英词典
Chinese-English Dictionary
MEANING OF 平面角
平面角
plane angle
〈名〉以二面角的棱上任意一点为端点,在两个面内分别做垂直于棱的射线,这两条射线所成的角叫做二面角的平面角。
píng miàn jiǎo/jué
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