The English word "book" used to be a tree.
英文单词book，最早指的是一种树。
Long ago, people in England wrote on wood.
很久以前，英国人把字写在木头上。
That tree was called "boc" in old English.
那种树，在古英语里叫boc。
Wooden boards were the first "books".
最早的“书”，其实是刻字的木板。
So "boc" slowly became "book".
后来boc慢慢变成了book。
Today we write on paper, not wood.
现在我们写字用纸，不用木头。
But the word still remembers its tree.
但这个词，还记得那棵树。
