英语语法分析

Besides cellulose, there are hemicellulose and lignin.

除了纤维素，还有半纤维素和木质素。

Trees containing less lignin and more cellulose would both grow faster and also produce more ethanol.

含低木质素高钎维的树木能够在既速长的同时又多产乙醇。

That is easier said than done, particularly if lignin is involved, since lignin is resistant to such conversion.

这个说比做要容易，由于木质素对于此种转换有抵抗力，所以尤其要把木质素解决掉。