A number of governments maintain permanent manned research stations throughout the continent.

The number is the service company that hangars and maintains the jet.

A number of local libraries, museums, and other institutions also maintain photography archives.

A number of schools maintain distributed computing class projects.

Even if the museum is closed, you need a certain minimum number of guards and conservators to maintain it.

A number of authors maintain that a definite need does exist.

Nowadays, the number of Basque speakers is maintaining its level or increasing slightly.

A number of organizations maintain Web sites with work sheets that consumers can use and valuable information for planning.

The body requires huge numbers of calories to gain weight and maintain it.

A number of countries maintain embassies in the neighbourhood.