wind turbine - n. a tall structure that has large blades attached to an engine and that is used to produce electricity
physical therapist - n. a worker whose job it is to help people with physical pain or health needs
nurse practitioner - n. a nurse who is trained to do some of the things a doctor does -- such as give physical exams or order certain medical tests
encourage - v. to make someone more determined, hopeful, or confident
participant - n. a person who is involved in an activity or event
accelerate - v. to move faster
modest - adj. not very large in effect or impact
challenges - n. to test the ability, skill, or strength of someone
welfare - n. a program that provides financial assistance to very poor people