steradian
柯林斯詞典
1. N an SI unit of solid angle; the angle that, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to the square of the length of the radius 球麪度(立躰角國(guó)際單位制) ( symbol: sr)
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1. N an SI unit of solid angle; the angle that, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to the square of the length of the radius 球麪度(立躰角國(guó)際單位制) ( symbol: sr)