The bio­inks are placed in three dispensers (分配器), containers, inside the printer. Lasers control both the position of the printing surface and the places where the bio­ink is released.

　　Michael Yost is a leader of the research team. He says the printing process is fully automated — machine­operated. He says that the Palmetto bio­printer makes it possible to create complex tissue types.

　　The researchers say bio­printing is still experimental. But they hope in a few years they may be able to print tissue to replace damaged human organs.

　　But there are still some problems which need to be solved. Some scientists worry about how to get blood to the replacement tissue. The flow of blood is important to keep the printed tissue alive.

　　Michael Yost hopes that more people will believe in the benefits of biofabrication.

　　“Tissue biofabrication is a reality, and it is a reality now, and if you come here and you get to see it. You will get to see it. You can't touch it, but you will see it and think this is real. And this is really human.”

　　语篇解读：本文是一篇说明文。从汽车配件到人体骨骼，3D打印技术在美国已经得到了广泛的应用。现在科学家们正致力于3D打印人体组织的生物制造研究。

　　1．What can we know about the bio­inks?

　　A．They are the necessities of bio­printing.

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