绒毛膜：在爬行类动物，鸟类及哺乳类动物中包含胚胎的外膜，在有胎盘哺乳动物中与胎盘的发育有关。
Chorion: the outer membrane enclosing the embryo in reptiles birds and mammals. in placental mammals it contributes to the development of the placenta.
绒毛膜：在爬行类动物、鸟类及哺乳类动物中包含胚胎的外膜，在有胎盘哺乳动物中与胎盘的发育有关。
Chorion: the outer membrane enclosing the embryo in reptiles birds and mammals. in placental mammals it contributes to the development of the placenta.
绒毛膜：在爬行类动物、鸟类及哺乳类动物中包含胚胎的外膜，在有胎盘哺乳动物中与胎盘的发育有关。
Chorion: the outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.
他们将研究对象限定为哺乳类动物，因为它们的身体运作和人类十分相似，而且规定这些研究对象是生活在有钱人身边或周围的哺乳动物。
They limited their search to mammals, whose bodies work much like humans' do—and, specifically, to those mammals living with or around people in the rich world.
他们将研究对象限定为哺乳类动物，因为它们的身体运作和人类十分相似，而且规定这些研究对象是生活在有钱人身边或周围的哺乳动物。
They limited their search to mammals, whose bodies work much like humans' do—and, specifically, to those mammals living with or around people in the rich world.
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