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单词 amnion
释义

amnion/ʹamni·ən/ noun (pl amnions amnia /-ə/)

a thin membrane forming a closed sac around the embryos of reptiles, birds, and mammals, and containing a watery fluid in which the embryo is immersed

amniotic /-ʹotik/ adj
[scientific Latin from Greek amnion caul, prob dimin. of amnos lamb]
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