A number of people try and prevent a man getting married.

Males will usually fight and large numbers prevent a single fish from being targeted.

A number of barriers prevent existing and potential food supplies from reaching those most in need.

This company employs a number of techniques to prevent fraud.

A limited number of medical conditions will prevent a new employee from being approved for coverage.

A number of changes eventually prevented the series from going into production as planned.

A number of problems prevented a connection for years.

This could mean that the number of representatives might prevent the Convention from working smoothly.

A number of obstacles are still preventing the single market from operating to its full potential.

Finally, a court should not have an even number of judges to prevent deadlocks; thus 23.