This involves mechanisms that are still being understood, but if you've studied some biology or read about this you've heard about the protein complex called Dicer.

人们仍然不太了解这其中的机制,但如果你学过一些生物学,或者读到过有关内容,你会听说过一种,叫做Dicer的蛋白质复合体

耶鲁公开课 - 生物医学工程探索课程节选