Vet assistants attend to so many different duties that are often invaluable parts of veterinary practices. (veterinarianedu.org)
People of the past would have said much the same about horses forever being a critical and invaluable part in the transport of people and goods but we know things change. (desmogblog.com)
In both patterns, the volunteer services of AA members are invaluable parts of the treatment program. (religion-online.org)