纤维素是植物细胞壁的主要成分。

Cellulose is the major constituent of plant cell walls.

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现在已经明白，细胞壁的成分和结构受到严密的控制。

It is clear that the composition and structure of the cell wall are strictly controlled.

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现在已经明白，细胞壁的成分和结构受到严密的控制。

It is clear that the composition and structure of the cell wall are strictly controlled.

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