外层的英文：
exothecium

参考例句：
  • infantile cortical hyperostosis
    【医】婴儿骨外层肥厚症
  • Between these are fixed precast concrete external cladding panels.
    在它们之间填上预制混凝土的外层空心板。
  • The outer layer of an internal organ or body structure, as of the kidney or adrenal gland.
    皮层内部器官或身体结构的外层，如肾或肾上腺皮层
  • The soft outer wall lining the shell of a tunicate or barnacle.
    有膜动物的柔软外皮被囊类动物或藤壶的壳的外层软壁
  • The outer layer of wallpaper.
    壁纸的外层。
  • The outer layer of a diploblastic animal,such as a jellyfish.
    外层双胚层动物的外层，如海蜇
  • A waterproof plastic skin on a metal sheet
    金属板的防水塑料外层.
  • Biscuits coated with chocolate
    外层有巧克力的饼干
  • Calyx encloses an unopened flower bud
    花萼围绕在花瓣外层的一圈。
  • A parka with a waterproof shell.
    具有防水外层的短外套
exothecium是什么意思：
外层; 蒴外层; 蒴外层

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