英文：A system of physical conditioning designed to enhance circulatory and respiratory efficiency that involves vigorous, sustained exercise, such as jogging, swimming, or cycling, thereby improving the body's utilization of oxygen.
英文：Now her teachers corps, called Teach for American is off and running. After a rigorous competition,500 recent college graduates won places out of a field of2, 500 applicants, proving Ms.Kopp's theory that making the corps selective would enhance its appea
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