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。
Let this be the angle d theta so it moves in a short amount of time over an angle d theta dS and the arc here is dS, R and the radius is R.
这是角度dθ,它运动了一会儿,运动过角度dθ,弧度是，半径是。
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