Their goal was extraordinarily ambitious.是什么意思？

Their goal was extraordinarily ambitious.

他们的目标极其宏伟。

their

pron. 他（她，它）们的，在提及性别不详的人时，用以代替 him 或 her；

例句
Their permissiveness toward their children reflects the wild abandon of their own lives.
他们对孩子的放任折射出他们自身生活的放浪形骸。

goal

n. 目标，目的，球门，终点，得分；

例句
Their goal was extraordinarily ambitious.
他们的目标极其宏伟。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

extraordinarily

adv. 很，十分，特别，极其，离奇地，出奇，倍加；

例句
She was quick-witted and had an extraordinarily agile mind.
她机智聪慧，思维极为敏捷。

ambitious

adj. 有雄心的，有野心的，费力的，耗资的；

例句
He was by his own account an ambitious workaholic.
据他自己所言，他是个雄心勃勃的工作狂。