In what place do you think it is difficult to read?
---I think it would be difficult to read on buses.
---Your eyes would have to constantly re-adjust themselves 频繁调整自己 or refocus for the images to project onto the retina 视网膜 of the eye.
---I had the bad habit of reading on busses and it caused severe
eye strains眼疲劳.
---pink eyes 红眼；急性结膜炎, or dry eyes
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