Bark may be used as raw material for paper-making.
树皮可以做造纸的原料。
《新英汉大辞典》
2
Exactly speaking, the raw materials are not only paper, but also gold foil, silver foil, bark, leaf, leather, cloth or fur.
没错来说，不仅是原材料纸张，而且金箔，银箔，树皮，叶，皮，布或毛皮。
3
Base on the choice of various raw materials, fresh bark was chosen to extract Iridoids compounds such as geniposidic acid (GPA), aucubin (AU) and geniposide (GP).