它们都有一个起点一个终点图中的蓝点，但二次方贝塞尔曲线只有一个红色控制点点而三次方贝塞尔曲线有两个。

A quadratic bezier curve has a start and an end point (blue dots) and just one control point (red dot) while a cubic bezier curve USES two control points.

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使用二次方和三次方的贝塞尔曲线是相当有挑战的，因为不像在矢量绘图软件Adobe Illustrator里那样有即时的视觉反馈。

Using quadratic and cubic bezier curves can be quite challenging, because unlike vector drawing software like Adobe Illustrator, we don't have direct visual feedback as to what we're doing.

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