童年就像一支笔，用完了就没有了。童年就像一条彩虹，看完了就没有了。童年就像一盒糖吃完了就没有了。童年就像一本书，看完了就没有在新的内容。

Childhood is like a pen, which is gone when used up. Childhood is like a rainbow, which will disappear after watching. Childhood is like a box of sugar that is gone after eating. Childhood is like a book. There is no new content after reading it.