... feeling of uselessness无用感 regarded as uselessness被废弃 The Uselessness of Pets没有用的宠物 ...
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Cellulose and hemicellulose could be used to produce fuel alcohol. However, lignin is often regarded as uselessness.
纤维素、半纤维素可用来生产燃料酒精，而木质素往往被废弃。
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