A triathlon(三项全能运动) is a sports event which combines three sports.
1 (typical) running, biking, and swimming. During a triathlon, athletes finish all three sports without stopping
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(beat)the clock. People of all ages and sizes can compete in triathlons. But much like other sports events, a lot of professional
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(compete)rule the triathlon world. In addition, many triathlon
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(hold) to benefit charity, much like marathons.
The modern triathlon appeared in California in
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1970s. It usually begins with the swimming.
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(follow) by cycling, and finally running. A triathlon tests the endurance(忍耐力)and speed of an athlete, as well as his or her ability to keep energy and focus
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the race as a whole. A triathlon competes against a clock, rather than against other athletes. A variation of the triathlon is a relay triathlon.
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a different athlete completes each stage.
The swimming stage takes place in a lake or the open ocean. As soon as athletes come out from the water, they change into cycling at the
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(fast) speed to save time. After cycling, the athletes change shoes to run. The course is considered complete once the athletes
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