由于骨骼不会在动物冬眠时生长，因此年轮缺失的现象使他们得出了原始的理论。

Since bones don't grow when an animal hibernates, the absence of rings led them to their original theory.

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由于骨骼不会在动物冬眠时生长，因此年轮缺失的现象使他们得出了原始的理论。

Since bones don't grow when an animal hibernates, the absence of rings led them to their original theory.

youdao