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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