In this, bioink gets loaded into a printing chamber and pushed through a round nozzle attached to a printhead.

这项技术将生物墨水载入打印机，然后将它挤入打印头上的柱状喷嘴。

All you need are two round nozzles. One a little bit bigger than the other so you get different size bubbles.

您只需要两个圆形喷嘴。一个比另一个大一点，所以你会得到不同大小的气泡。