These differences would require modifications to current infrastructure and vehicle design.

A difference in mass requires that the masses are not all 0.

This fundamental difference with the position of earlier radicals required theoretical analysis in two areas.

"Yet after days of discussions, it is clear these differences will require more time to be worked out."

Overcoming differences requires tolerance and mutual respect and takes time.

Too often that difference had required great sacrifice from great men and women.

Those differences, he said, would require his team to concentrate more on initiating defense higher on the court.

This difference can be determined from the air pressure at each craft, and does not require knowledge of the local air pressure on the ground.

The authors also concluded that differences in the rates of side effects required further study.

All these differences require different strategies and skills than the Mahres used in international races.