Ballroom dancing has long been considered a form of healthy exercise in China, with large groups gathering in parks or sports grounds to whirlaway to piped-in music.
集体舞在中国被认为是一项健康运动，在公园和体育场都可以看到大量的人们随着音乐起舞。
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To free electrons, something has to make them whirl fast enough to break away from their nuclei.