病人们都没有恢复正常视力，但他们都反映说，有一定的改善。
While normal sight wasn't restored in any of the patients, all reported some improvement.
吸烟与肺癌发病的正比关系；年龄与正常视力之间的反比关系。
The positive correlation between cigarette smoking and the incidence of lung cancer; the negative correlation between age and normal vision.
今天，我的朋友告诉我她不担心自己几乎失明的事实，她只有正常视力能力的12%。
Today, my friend told me she didn't mind being legally blind, with only 12% of her vision.
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