名词
中文翻译：Unknown
同义词：
['perennial', 'annual', 'recurrent']
例句：
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1. The tree's bark is covered with perennation marks.
这棵树的树皮上覆盖着年轮标记。
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2. The plant's growth pattern is a result of its perennation process.
这种植物的生长模式是其年轮形成过程的结果。
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3. The perennation process is responsible for the tree's growth.
年轮形成过程是树木生长的原因。