calycle

n.副萼,萼外小托叶

花托（植物器官，包围在花瓣和花蕊外部，起保护和支持作用）

名词

1. The calycle of the flower is green and serves as a protective covering.
这朵花的花托是绿色的，起到保护作用。

2. The calycles of some flowers are highly modified and have colorful petals.
有些花的花托经过高度改变，拥有丰富多彩的花瓣。