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。
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。
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.
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