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※ 引述《Ortos (PIAT!!)》之銘言：
: So far in this chapter, we have looked at the structure of a typical
: plant cell in the prime of its life.
: Like organisms, cells have a life cycle that includes youth, maturity, and
: old age. At the end of their life cycle, cells can either divide or die. For
: plant cells, death is not necessarily the end of their usefulness because
: the cell walls of dead cells become permanent parts of the plant body.
: In large trees, for example, more than 99% of the cells in the trunk
: are dead. These cells serve a variety of useful functions, including
: conducting water and providing the structural support necessary to lift the
: leaf canopy into the sunlight.
: 到本章為止 我們已經看過了植物成熟時期的構造 就像一個生物的生命週期 細胞也有幼
: 年 成熟 老年期 當一個週期完成時 細胞可以選擇分裂或者死亡 就植物而言 死亡並
: 不代表失去功能 像死細胞的細胞壁就成了植物體永久的一部分 例如一棵大樹
: 99%的樹幹細胞是死的 這些細胞仍然有著重要的功能 包括輸送水分 支撐樹冠層使其
: 可以吸收陽光
: 無聊翻譯一下
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