You should do eye exercises twice a day and examine your eyes in time.
你应该每天做两次眼保健操，并及时检查眼睛。
Be sure to do some eye exercises to relax your eyes after you study for a long period of time.
在长时间学习后，一定要做眼保健操来放松眼睛。
Without my textbooks, I had to read and do exercises on a computer screen, which hurt my eyes.
没有课本，我不得不在电脑屏幕上阅读、做练习，这伤害了我的眼睛。
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