WEBa substance that is naturally produced, for example by plants or insects, and can be used as a material for making things or as fuel: They use biomaterials made from agricultural waste and crop residue, including potato starch and coffee bean shells. 他们使用的生物原材料来自农业废弃物和农作物残渣,比如土豆淀粉、咖啡豆壳等。