This can be especially useful when you're under a lot of physical or emotional stress.

It is especially useful in the treatment of children and infants.

It can be especially useful in areas of dense fat such as the back.

This could be especially useful as preparation before a museum visit.

This is one of the ways in which computers are especially useful to our work.

I think you said such cards were especially useful for students in their gap years.

This makes them especially useful in some people with certain forms of heart failure who may also have high blood pressure.

He said it would be especially useful to such people if they travel a lot.

He had never before considered his carriage as especially useful.

This character is especially useful at family rank and higher.