眼保健操 Eye Protection Exercise

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In Chinese school, it is the rule that students need to do eye protection exercise during the break time, all the students will do it when they hear the music. The exercise seems not important for me, because I don’t think it works, but my sister tells me that her eyesight is better than her classmate since she takes the eye protection exercise, so I keep the exercise every day. 
在中國的學校，學生需要在課間做眼保健操，這是規則，所有的學生在聽到音樂時都要做。這個操對於我來講似乎不是那麼重要，因爲我覺得它沒有起到作用，但是我的姐姐告訴我她的視力比同學的好，因爲她做眼保健操，因此我也每天做眼保健操。