Put simply, RSI is an injury caused by repetitive activity.

简单说来，RSI是一项由于重复性的动作带来的损伤。

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Exercise, on the other hand, is a structured and repetitive form of physical activity that you do on a regular basis.

锻炼，从另一个方面来讲，是一种结构化和重复的身体活动形式，前提是该活动要定期进行。

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They asked a second group to imagine an activity that was equally repetitive, but less filling: pumping 33 quarters into a clothes dryer.

科学家又要求第二组人员想象等同的重复动作，但与吃无关：往干衣机里塞东西33次。

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That dynamic is a mix of roleplaying rules (levels, experience points, etc) with wait-or-pay rules (energy, building with clicks, paying to shortcut) and guided goals through a repetitive activity (digging, questing, item assemblage).

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Aerobic activity is a repetitive rhythmic exercise involving large muscle groups such as legs, shoulders and arms.

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In that detail the Conservatives see "tiresome, repetitive" statistics stuck in one place to "make it look as if a lot of activity is going on".

BBC: My big, fat Welsh annual report.