involute

The moves in chess are not only manifold, but involute..下棋的走法不但多种多样， 而且错综复杂。

If we unwind this paper, each point on the angular edge generates an involute curve ..如果我们伸展这纸，每点在那之上有角的边缘产生一纷乱的曲线。

The shape of the tooth is an involute helicoid ..形状那牙齿是一纷乱的螺旋状的。

involute gear,渐开线齿轮

involute spline,渐开线花键

involute profile,渐开线齿形；渐开线齿廓