concurrent lines的意思|示意

Construct an animation displaying an astroid sliding along three fixed concurrent lines meeting at 120 degrees.

建构一动态绘图:展示星状线的滚动,沿著共点及间隔120度的三切线.

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Construct an animation displaying a nephroid sliding along three fixed concurrent lines meeting at 120 degrees.

建构一动态绘图.展示肾脏线的滚动,沿著共点及间隔120度的三条直线.

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