他们发现了那条联系着他们和妈妈的生命线——那条从母亲的血液中源源不断输送营养的脐带。
They explored it and found the life cord which gave them life from their mother's blood.
最有名的是一类叫血管生成抑制剂的化合物，它们能阻止肿瘤生成新的血管来给自身输送营养和氧气。
And, most famously, the class of compounds known as angiogenesis inhibitors keep tumors from building new blood vessels to supply themselves with food and oxygen.
哺乳动物将营养物质输送到骨细胞的微小管道是平行排列的，而鸟类的管道则是随机排列的。
Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes form a random pattern.
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