These microscopic bacteria and protozoa break down cellulose and fiber into digestible nutrients.

这些微小的细菌和原生动物可分解纤维素．成可吸收的营养。

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These microscopic bacteria and protozoa break down cellulose and fiber into digestible nutrients.

这些微小的细菌和原生动物可分解纤维素．成可吸收的营养。

youdao