They just wait, they wait for their time, they wait until you are in danger from a particular antigen.

它们时刻准备着,在等待着那一刻,等待你被某种特别的抗原威胁的时刻

耶鲁公开课 - 生物医学工程探索课程节选

Generally, there are a couple of elements that one might set down as in a Petri dish, and wait to see if some chemical reaction might take place, but not at all sure of what it might be.

一般来说，都有几个元素,作者会把它们像放入培养基中一样培养,等待某种化学反应的产生，但对可能的结果却一无所知。

普林斯顿公开课 - 人性课程节选