Some countries are already trying to convert to renewable energy and though it is definitely a long process, it is very doable.

有些国家已在转换使用再生能源，过程必定费时，但这是可行的。

youdao

Even so, the equipment-makers argue that, though doable, all this sensing palaver makes white-space devices needlessly complicated and expensive.

ECONOMIST: Difference Engine

By keeping a narrow focus on what he believed was doable, even though naysayers told him it would never pass, and by asking abolitionists to tone down their demands, he demonstrated enlightened self-interest.

FORBES: Obama in Israel: Was His Leadership Smart or Wise?