很多的茎和根都是辐射对称的。

Many stems and roots show radial symmetry.

先焊炉底板间对接焊缝，由中间往四同辐射对称焊接。

First, weld the butt seams on the bottom plate of the furnace, with radiating and symmetric welding conducted from the central point.

结果表明：香梨为完全花，伞房花序，花冠轮生辐射对称，雄蕊16～30枚，柱头多为5枚，极少数为6枚。

The results were as follow:complete flower, corymb inflorescens, imferior ovary, rotate corolla, androecium with 16~30 stamens, compound pistil with 5~6 stigmas;