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Chorion: the outer membrane enclosing the embryo in reptiles birds and mammals. in placental mammals it contributes to the development of the placenta. 羢毛膜：在爬行類動物，鳥類及哺乳類動物中包含胚胎的外膜，在有胎磐哺乳動物中與胎磐的發育有關。