事情看似平静下来，老宛心中却积留了很多怨气。在佰见家的一次倾谈后，老宛高歌一曲忧伤的歌。
Things may seem quiet down, but a lot of grievances remained in Lao Wan's heart. After a talk in Bai Jian's, Lao Wan sang a sad song.
夏鸾翔是晚清较早研究微积分的中算家，据其《致曲术》、《万象一原》，可知他在二次曲线求积问题上得到了比较全面的成果，有的已超过《代微积拾级》，某些成果近似近代的椭圆积分。
This paper discusses Xia's achievements on the integral problem about quadratic curve, some of which were similar to modern elliptic integral and surpassed the level of Dai-wei-ji.
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