having a strong wish to be successful, powerful, or rich

an ambitious young lawyer 雄心勃勃的年轻律师

He's very ambitious for his children (= he wants them to be successful). 他望子成龙。

If a plan or idea is ambitious, it needs a great amount of skill and effort to be successful or be achieved.

She has some ambitious plans for her business. 她雄心勃勃，打算扩大经营规模。

The government has announced an ambitious plan to modernize the railway network. 政府已经宣布了实现铁路网现代化的宏伟规划。

The original completion date was over-ambitious, so we have had to delay the opening. 当初在确定完工日期的时候太雄心勃勃，后来我们不得不把落成典礼推迟。