名词
中文翻译：Unknown
同义词：
['leaf sheath', 'leaf sheaths']
例句：
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1. The plant's coleoptile is the first part of the stem to grow.
植物的叶鞘是茎的第一个生长部分。
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2. The coleoptile is where the roots begin to form.
叶鞘是根开始形成的地方。
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3. The coleoptile is a small, thin tube that grows from the base of the stem.
叶鞘是一个小而薄的管状结构，从茎的底部生长出来。