Tracheid

（重定向自Annular ring）

Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts. Tracheids are one of two types of tracheary elements, vessel elements being the other. Tracheids, unlike vessel elements, do not have perforation plates.

单词	Annular ring
释义	Annular ring 原声例句 CNN 10 暑期特辑 That leaves the annular ring of sun that can be visible in this weekend's celestial event. 这样一来，本周末的天象中就可以看到太阳的环形圈了。英语百科 Tracheid （重定向自Annular ring） Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts. Tracheids are one of two types of tracheary elements, vessel elements being the other. Tracheids, unlike vessel elements, do not have perforation plates.
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