Wikipedia) 如果用 极坐标 表示，其通用数学表达式为： 其中， a 、 b 为系数， r 螺线上的点到坐标原点的距离， θ 为转角。 这正是一个以自然常数e为底的指数函数。 例. 知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业.
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