The embryo development belongs to Onograd type.

胚胎发育为柳叶菜型。

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And serum and amino acid are necessary for embryo development.

胚胎的发育过程中，血清和氨基酸都是必需的。

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Embryo development is one of the most important subjects in life science research.

胚胎发育一直是生命科学研究的主题之一。

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This process of cell proliferation or cell division is, of course, very important during development of an embryo.

细胞增殖和分裂的过程,在胚胎发育中至关重要

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During development of the embryo it goes from being a single cell, the fertilized egg, to being a multi-cellular organism with billions of cells in it.

胚胎的发育,始于一个单一细胞,即受精卵,直到形成一个以十亿计数量的细胞构成的,多细胞有机体

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We can see the early signs of ear development Start with the thickening of the outer layer of the embryo, this layer is called the ectoderm.

大家知道，耳朵发育的早期特征,是胚胎外层膜的增厚，这层膜也叫外胚层。

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That furnishes the egg with enough water to carry out the reactions of embryo development.

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The theory is that the protein in sperm which triggers chemical changes in the egg, leading to embryo development, is defective or missing from the sperm of some infertile men.

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Occasionally, the extra chromosome doesn't appear until early in the development of the embryo.

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