But the science, technology and economics of treethanol are changing fast.Researchers are racing to develop ways to chip, ferment, distil and refine wood quickly and cheaply.

• 由于科学技术和树乙醇经济的快速发展，科研部门正各显神通，竞技找出既快速又便宜的粉碎、发酵、蒸馏及提炼的良方。