petal

/ˈpet.əl/

any of the usually brightly coloured parts that together form most of a flower

通常构成鲜艳花朵的颜色的部分；花瓣

例：rose petals

玫瑰花瓣

Petal comes from the Greek word petalon, meaning "leaf, thin plate." A petal is the lovely colorful leaf-like ring around the center of the flower, a thin plate for a fairy. The petals make up a flower’s corolla, surrounding the center. 

花瓣来自希腊语单词petalon，意思是叶子，薄板。花瓣颜色各异，像叶子一样的形态围绕在花的中心一圈。花瓣整体组成一个花冠，围绕着花的中心。

除了“花瓣”是一瓣一瓣的，常见的许多蔬菜水果也有类似的结构。比方说：橘子剥皮后，呈现一瓣一瓣的，做菜常用的“蒜”也是一瓣一瓣的，这些“瓣”的英文跟“花瓣”不同，英语中有对它们专门的单词。

segment

/ˈseɡ.mənt/

one of the small parts that a fruit such as an orange is naturally divided into

水果比方说橘子内部分开的一部分；(水果)瓣

例：The salad was decorated with segments of orange.

色拉上点缀了橘子瓣。

clove

/kləʊv/

a small separate part of a bulb of garlic (= a plant used in cooking)

大蒜（一种用于烹饪的植物）生球茎状部分里的分开的部分；蒜瓣

例：This recipe takes four cloves of garlic.

这份食谱需要4瓣蒜。