Tree rings are made of tissue called xylem.
构成年轮的组织被称为木质部。
Tree rings are the obvious, and most controversial, example.
树的年轮是最明显但又最有争议性的一个例子。
To study tree rings, researchers generally take a pencil-sized core from a tree.
为了对年轮进行研究，研究人员通常会从树木取出一块铅笔大小的核心部分。
The tree people in the Lord of the Rings—the Ents—can get around by walking.
《指环王》里的树形人，即树精，可以四处走动。
We can tell the age of a tree from its growth rings.
大树的年龄，告诉我们它的成长过程。
The growth rings on a tree tell him.
这就是树木的年轮告诉他的。
If a tree becomes old it will leave circuits of growth rings.
树老了，会留下一圈圈的年轮。
If a tree becomes old it will leave circuits of growth rings.
树老了，会留下一圈圈的年轮。
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