It is the root circle of the external spline or the inside circle (tooth tip circle) of the internal spline.
它是外花键的齿根圆，和内花键的内圆(齿顶圆)。
It is the outside circle (tooth tip circle) of the external spline or the root circle of the internal spline.
它是外花键的外圆(齿顶圆)，和内花键的齿根圆。
This circle along with the tooth tip circle (or start of chamfer circle) determines the limits of tooth profile requiring control.
渐开线终止圆与齿顶圆（或者修缘线的起点所在的圆）共同限制了所要求控制的渐开线齿廓的范围。
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