| 单词 | placental |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔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美国传统〔eutherian〕Of or belonging to the infraclass Eutheria, a division of mammals to which all the placental mammals belong.真哺乳亚纲的：关于或属于哺乳动物真兽亚纲的一个下纲，包括有胎盘哺乳动物美国传统〔marsupial〕The study sheds light on the genetic differences between placental and marsupial mammals. 这一研究让人了解胎盘哺乳动物和有袋哺乳动物在基因上的差异。剑桥高阶〔passive immunity〕Immunity acquired by the transfer of antibodies from another individual, as through injection or placental transfer to a fetus.被动免疫：以转移来自另一个体的抗体而获得的免疫力，如通过注射或通过胎盘转移给胎儿美国传统 |
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