Her mother was a teenage mother, as well as her grandmother, so you can see the cycle of teen pregnancy,"

VOA: standard.2009.12.04

Well, so now I can complete the cycle.

好，现在我可以让这个循环闭合。

麻省理工公开课 - 热力学与动力学课程节选

Well, then you could imagine a cycle here where activation of the receptor is leading to production of more ligand, is leading to activation of the receptor and production of a ligand.

那么,你就能画出一个循环图,激活受体能导致,更多配体的生成,这些配体又会刺激受体生成更多配体

耶鲁公开课 - 生物医学工程探索课程节选