In the ovaries of the female reproductive system, an ovarian follicle is a fluid-filled sac that contains an immature egg, or oocyte. These follicles are found in the ovaries. During ovulation, a mature egg is released from a follicle.
from google
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• 谢谢白兔妈!明白了,我以为是长了什么不好的东西,这下放心了 -anqi07- ♀ (0 bytes) () 10/09/2019 postreply 18:44:12