This endeavour required extra knowledge and appropriate skills.

However, the endeavour required some time, and the enthusiastic artillery gunners became impatient, not wanting to wait for completion of the new road.

A reindeer hunt can be a short afternoon outing without much equipment, or a week-long affair with all the equipment that such an endeavor requires.

This endeavor should have required no great effort.

All human endeavors (as he himself pointed out) require the manipulation of nature's resources.

In a city as complicated and unforgiving as New York, almost any worthy endeavor requires men and women of great imagination.

No other national endeavor requires as much unshakable resolve as war.

All these endeavors require more and more costly technology.

However, these endeavors would require resources far beyond the organization's existing capacity.

Such deaths were regrettable, yes-yet every great endeavor had required sacrifices.