名词
中文翻译：年轮
同义词：
['seasonal growth ring', 'annual growth ring']
例句：
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1.The tree's spring tracheids are visible through the bark.
通过树皮可以看到树木的年轮。
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2. The scientist studied the seasonal growth rings to determine the age of the tree.
科学家研究了季节性生长纹来确定这棵树的年龄。
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3. The researcher found that the growth rings varied with each season.
研究人员发现每个季节的生长纹都有所不同。