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1.The vitelline sphere is a crucial part of the embryonic development.
卵黄囊是胚胎发育的关键部分。
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2.In this study, we focused on the role of the vitelline sphere in early human development.
在这项研究中,我们关注了卵黄囊在人类早期发展中的作用。
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3.The vitelline sphere plays a vital role in nutrient transport and metabolism.
卵黄囊在营养物质的运输和代谢中起着至关重要的作用。