He gashed his leg while felling trees.他砍树的时候砍伤了腿。They are felling all the trees in this area.他们在砍伐这个地区的所有树木.Because you let me have that kind of disjunctive felling.因为你让我有了那种分离的感觉。...
Selective dehydration of hexose, such as D - fructose, is one of main synthetic methods for 5 - hydroxymethylfurfural.果糖等己糖选择性脱水是制备 5- 羟甲基糠醛的主要方法之一....