It is how to maintain a strong economy without the drug of military production.

"At that time we couldn't have maintained the space without people living here."

Order should be maintained without the use of lethal force.

While the network is still No. 1 overall, it cannot hope to maintain that lead without some support from its new shows.

After several days of practice Duncan was able to maintain this for ten minutes without too much effort.

The investigators found the patients could not maintain their weight loss without the drugs.

How do they maintain that density of population without materials and energy from space?

It's almost impossible to maintain a house properly without one.

"America cannot maintain a leadership position without human access to space," Armstrong said.

The Company could not hope to maintain harmony and order without the assistance of these men.