外鞘的英文

epitheca

exotheca

sheath

vagina externa

• 外:    outside; external ...
• 鞘:    whiplash
• 毛根外鞘:    external root shea ...

例句与用法

1. Spirochetes long spirally twisted bacteria surrounded by a flexible wall
   螺旋体：是具有弹性外鞘的长形螺旋盘绕细菌。