A kite is a quadrilateral with one line of symmetry.

风筝是个有一条对称线的四边形。

A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.

四个边相等的平行四边形；不是直角的等边平行四边形。

In this chapter, we partially solve the problem of inner radius of univalence for some parallelogram, applying the properties of extremal sets of Schwarz derivatives.

在这一章我们利用Schwarz 导数极值集的重要性质部分的解决了几类平行四边形的单叶性内径。