Reduce radius of synodical arc of tee.
缩小三通相贯区内拐角处圆弧半径。
the radius of curvature of our arc, which is also an air track, equals 115 plus or minus five meters.
,这个弧度的半径，也是个空气轨道，等于115上下5米。
A radian is the Angle subtended by an arc of a circle whose length is just equal to the radius.
一弧度就是长度刚好等于半径的一段圆弧所对的圆心角。
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