Now, how did the black-lead get there? Did it grow inside the wood?

那么铅笔芯是怎么进去的呢？难道是在木头里长出来的吗？

Also, one is pretty and one is pencil lead.

另外，一个很漂亮， 一个是铅笔芯。

When you rub the point on a piece of paper, little bits of black-lead stick to the paper and make black marks.

铅笔儿在纸上蹭的，会有一点儿铅笔芯附着在纸上，留下黑色的印子。

The pencil is a round piece of wood, is it not? At each end of the pencil you can see a small square of black-lead.

铅笔是一根圆形的木杆，两头都可以看见里面铅笔芯的小方块。

The old man paused in licking his stub of pencil, so that the lead made a purple stain on the exposed tip of his tongue.

老人停下来舔他的铅笔头，铅笔芯在他裸露的舌上留下了紫色的污渍。

But it's just carbon, the same element that makes up the graphite in this pencil lead, which is so soft, that it's intended purpose is to rub off on stuff.

但它只是碳， 与构成这支铅笔芯中的石墨的元素相同，它非常柔软， 其预期用途是擦掉东西。