单语范例（未经PONS编辑处理）
英语
- Each pole receives blood from three major veins: the vitelline vein, the umbilical vein and the common cardinal vein.en.wikipedia.org
- Each egg contains about 24 vitelline cells and a central unembryonated ovum.en.wikipedia.org
- The left umbilical vein becomes the ductus venosus and the right vitelline vein becomes the portal vein.en.wikipedia.org
- The vitelline glands, which produce the yolk for the eggs, are widespread in the lateral field from the pharynx to the posterior end.en.wikipedia.org
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英语