But in fact, if you just run your fingers again and again over this floppy disk you are disorienting those particles or knocking them off perhaps altogether, depending on the medium.

事实上，如果你把手指一次次的在磁盘上面滑动,这些粒子就会变的无极性,或者把它们整个搞坏，而这取决于媒介。

哈佛公开课 - 计算机科学课程节选

printf So here I'm culling printf in a loop again and again, but I'm literally overwriting the previous thing that I wrote.

所以这里我一次次地在循环中使用，但是我逐行地覆盖了我之前所写的东西。

哈佛公开课 - 计算机科学课程节选

Those billions of cells come from successive rounds of cell division.

这数以十亿计的细胞,都来自一次次的细胞分裂

耶鲁公开课 - 生物医学工程探索课程节选

You start off and you go down, down, down, and then you come up, then you get your first REM cycle, again, again, again, again, again, and then you wake up.

从第一阶段开始，到下面的阶段，然后又往上，这时就出现REM睡眠，然后再一次次地循环，直到你睡醒。

耶鲁公开课 - 心理学导论课程节选