A membranous structure in a hollow organ or passage,as in an artery or a vein,that folds or closes to prevent the return flow of the body fluid passing through it.

 
  • 瓣,瓣膜在中空器官或管道,例如静脉或动脉血管中的膜状结构,能够收紧或关闭以防止通过其的体液倒流
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