The drug is primarily useful in the treatment of depression and anxiety.

It is useful primarily when parts of a class are generated automatically.

He once said that his title was primarily useful for securing hotel rooms.

Positions six and seven are primarily useful in the lower part of the trombone's range.

The missiles are useful primarily as weapons of political terror and intimidation.

A hand drill (No. 8) is useful primarily in starting holes for screws.

Some historians view the intervals as primarily useful in maneuver.

Although the disks are free to the public, they will be useful primarily to researchers and organizations.

This is primarily useful for extraordinarily large data stores, accessed without human operators.

Ratios are primarily useful for their ability to indicate relative efficiency.