All these steps, including the tricky one of recovering sugar from cellulose, can be done already, but not cheaply enough to produce tens of billions of gallons a year.

所有这些步骤，包括那个有技术含量的从纤维素中提取糖类，都已经可以实现，但成本较高还不能实现工业化。

youdao

All these steps, including the tricky one of recovering sugar from cellulose, can be done already, but not cheaply enough to produce tens of billions of gallons a year.

所有这些步骤，包括那个有技术含量的从纤维素中提取糖类，都已经可以实现，但成本较高还不能实现工业化。

youdao