树的年龄，藏在哪里？

Cut a tree, and you see circles. 把树锯开，就能看到一圈圈的纹。 These rings are the tree's diary. 这些年轮，就是大树写的日记。 Each ring stands for one year. 每一圈，都代表一整年。 Wide rings mean a rainy, happy year. 圈宽的年头，雨水足，过得舒服。 Thin rings mean a dry, hard year. 圈窄的年头，干旱少雨，日子难。 Scientists read rings to learn old weather. 科学家读年轮，就知道古时候的天气。 The tree never forgets a single year. 这棵树，哪一年都不会忘。