四边

A kite is a quadrilateral with one line of symmetry.

风筝是个有条对称线四形。

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

四个相平行四形；不是直平行四形。

Book letter putamina by quality requirements, the four sides then use bamboo scratch tight wrapping to prevent curling down and up empty.

书封壳在按质量要求做好后，四再用竹刮刮紧包，防止包不紧及起空。

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.

在这我们利用Schwarz 导数极值集重要性质部分解决了几类平行四形单叶性内径。