Things written in pen you can't change. That's DNA. But things written in pencil you can.

用钢笔写下来的东西是无法改变的。这是 DNA。但是用铅笔写下来的东西是可以改变的。

youdao

Take the fattest marking pen you have, scratch that out and replace it with atomic hydrogen.

用你最粗的笔把它划掉，再用氢原子代替它。

youdao

Have you got a pen handy?

你手头有钢笔吗？

《牛津词典》

To make it,you need a milk carton, a pencil,a ballpoint pen, scissors and a pencil sharpener.

VOA: special.2010.12.28

Take the fattest marking pen you have, scratch that out and replace it with atomic hydrogen.

用你最粗的笔把它划掉，再用氢原子代替它。

麻省理工公开课 - 固态化学导论课程节选

And I try to imagine, well, first, imagine being really, really stiff, because you're not flexible when you're a ball point pen.

让我试着想象，首先，想象自己变得非常僵硬，因为圆珠笔是不会动的。

耶鲁公开课 - 死亡课程节选

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