采用正弦和余弦的泰勒展开式构造的迭代公式，计算一个绘图点只需9次加法。

Adopt the iterative formula that forms Taylor's expansion of sine and cosine, and compute a graphic points are only calculated by 9 times addition.

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在最初的需求定义阶段，我们可以随意地将注意力集中在“绘图点”，这样让我们能够顺利地探索各种可能的设计概念。

In the initial requirements definition phase we are free to focus only on the "plot points," allowing us to be fluid as we explore design concepts.

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绘图工具不能提供足够的信息来确定这一点。

The drawing tool does not give enough information to know this.

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