年轮

例句：

1. 1. The tree's trunk has many clear and distinct rings, each representing a different year.
   这棵树的树干上有许多清晰且不同的环，代表不同的年份。
2. 2. The old oak tree has an impressive collection of annual rings.
   这棵老橡树拥有令人印象深刻的年度环集。
3. 3. The scientist examined the tree's rings to determine its age.
   科学家检查了这棵树的环来推断它的年龄。