Building the railway was a very ambitious undertaking under local conditions.

What was originally an ambitious undertaking now became a race against time to meet the game's deadline with only half of a development team.

"This is the most ambitious undertaking we have been a part of."

He called the center "one of our most ambitious undertakings."

This was a very ambitious undertaking, given the state of aviation at the time.

It's an ambitious undertaking for a place with only 26,000 residents.

But many of this year's events are more ambitious undertakings.

It seemed a rather ambitious undertaking for someone who hadn't even been thirty when he died.

Economic and monetary union alone cannot ensure the success of such an ambitious undertaking.

Burke could not command resources for so ambitious an undertaking.