Technology combining genetic engineering of cells with chemical engineering to create artificial organs and tissues such as skin, bone, heart valves, and cartilage for joints.
结合细胞遗传工程和化学工程以创造器官和组织如：皮肤、骨头、心脏瓣膜和软骨关节的技术。
However, there are several problems with artificial heart valves.
然而，对于人造心瓣膜来说还是有许多的问题。
Artificial mechanical aortic and mitral valves were intermittently sutured.
间断缝合人工机械二尖瓣膜和主动脉瓣膜。
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