政府计划在十年内完全转向可再生能源，这个目标非常宏大。

The government's plan to shift entirely to renewable energy within a decade is highly ___ambitious.

她将业务扩展到三大洲的宏伟计划需要付出巨大的努力。

Her ___ambitious plan to expand her business across three continents will require immense effort.

将旧工业区改造成一个绿色公园是一个雄心勃勃但值得一试的想法。

Transforming the old industrial zone into a green park is an ___ambitious but worthwhile idea.