Memory cells are long lasting cells that remember this exposure and can respond very quickly on second exposure.

记忆细胞可以长时间记忆与抗原的接触,并在再次免疫中迅速做出应答

耶鲁公开课 - 生物医学工程探索课程节选

That depends on how much sleep you get but dreams leave fragile memories. They fade quickly.

这要取决于你一晚睡多长时间,梦境会留下一些若有若无的记忆，而且很快会淡忘。

耶鲁公开课 - 心理学导论课程节选

We're trying to understand exactly what changes in your brain when you learn and how those changes persist over time to support memory. And one thing that we know which helps explain why some things are easier to remember than other is that learning is not a unitary process.

我们一直都想查明，学习的时候，大脑到底发生了什么变化，这些变化是如何长时间控制记忆的,我们都知道，学习的过程不是一元化的,这就是为什么有的东西好记，有的东西难记。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选