Synthetic vessels made of Teflon exist, but they are prone to infection and blockage by blood clots, and tend to work for only a few months.
现已存在聚四氟乙烯制成的人造血管，但它们很容易感染和形成血栓，且往往只能起几个月的作用。
The blood ran down the faster, to be sure, but I was my own master again and only tacked to the mast by my coat and shirt.
血当然比先前淌得更厉害，但是我又自由了，只有上衣和衬衫还钉在桅杆上。
The results showed that the umbilical cord blood of pregnant woman who did not suffer from infectious diseases was not only used by clinic as blood fountain but also used to treat various-anemia.
结果表明无传染病的正常孕妇分娩时的脐血，可作血源供临床使用并能用于治疗多种原因引起的贫血。
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