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单词 胚胎期
释义 DEFINITIVE EXAMPLES 权威例句〔morula〕The spherical embryonic mass of blastomeres formed before the blastula and resulting from cleavage of the fertilized ovum.桑椹胚:形成于囊胚之前且处于胚胎期内的球形裂球群,由受精卵细胞的分裂而成美国传统〔myelencephalon〕The posterior portion of the embryonic hindbrain, from which the medulla oblongata develops.末脑:胚胎期后脑的后部,延髓在此发育美国传统
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