1. This Central American country has one of the most ambitious programs in the world to reserve the ecological diversity of its tropical rain forests.
    这个中美洲国家为保护其热带雨林的生态多样性，已制订出世界上最为雄心勃勃的的规划之一。

2. He is an ambitious boy.
    他是个有野心的男孩子。

3. Most of us fail in our efforts at self-improvement because our schemes are too ambitious and we never have time to carry them out.
    我们大多数人想自我完善却遭到失败，这是因为我们的规划过于宏大，而又根本没有时间去实施。