Not the sharpest pencil in the box.

他身上还带着公文包。

First off, you want to make sure you have a very sharp lip pencil.

首先，你得准备一支很尖的唇线笔。

And I always make sure I have a sharp pencil before I start.

在开始之前，我总是确保我有一支锋利的铅笔。

They held sharp pencils, the kind that drew blood when you were jabbed with them.

他们拿着锋利的铅笔， 就是那种被戳破就会流血的铅笔。

Which you can imagine as a stream of electrons that we used as a very sharp pencil that they used to create tiny structures on top of the foil.

你可以把它想象成一股电子流，我们用它作为一支非常锋利的铅笔，用来在金属箔片上制造微小的结构。