There is significant different for exercise frequency, time and intensity at different stage.

不同锻炼阶段参加闲暇体育锻炼的频度、时间和强度差别具有显著性；

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There is significant different for exercise frequency, time and intensity at different stage.

不同锻炼阶段参加闲暇体育锻炼的频度、时间和强度差别具有显著性；

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