从树、草和其它含有大量纤维素的生物资源中制出的乙醇，其“能量平衡”值起码在理论上能高达16。

But for ethanol made from trees, grasses and other types of biomass which contain a lot of cellulose, the energy balance can be as high as 16, at least in theory.

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能够产生纤维素酶的微生物的产酶能力低下，且所产生的酶的组分不全或不平衡。

Microorganism that can produce cellulase has low ability to produce enzyme, and the components of the produced enzyme are incomplete or unbalanced.

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