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液压传动的两个重要特性是什么?
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In the Song dynasty, Chuiwan, a primitive soccer game using a leather ball filled with hair, etc. was very popular among people.
Tai Chi Chuan, also called deep breathing exercise, is practiced by the Chinese on a regular basis to keep fit.
The first modern Olympic Games was held in Athens in 1896, and the Olympic motto is faster, higher, stronger.
Modern martial arts consist of five categories: boxing, weapon exercises, sparring exercises, actual combat and teamwork.
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