胚胎期（The period of the embryo）(附著-8 weeks) 器官、系统发展重要时期 胚胎形成3层： 外胚：神经系统和皮肤 中胚：肌肉、骨骼、循环系统、内部器官 内胚：消化...
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The content of rare earth in embryo increased with the increasing of hatch period, however the barrier effect of different rare earth element was greatly different.
稀土在胚胎中的含量，随孵化时间增加而增加，但不同稀土元素其屏障作用差别较大。
Embryo transfer is the best way for cattle improvement, for it has the following advantages: simple operations, low cost, short period of improvement and less disease dispersal.
而胚胎移植是引种的一种最好手段，具有方法简便、成本低、缩短改良时间、减少疾病传播等优点。
After going through several important sea-land changes and orogenic movements, Hubei has formed the embryo of the modern geomorphology gradually until the late stage of Tertiary Period.
湖北经历过几次重要的海陆变迁和造山运动后，到晚第三纪时，逐渐形成了近代地貌的雏形。
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