他的视力很差，不戴眼镜无法读书。
His eyesight isn't very good. I have to wear glasses for reading.
他的视力很差，因为他做了太多的工作。
他的视力很差。
他的视力很差。
然而，他视力很差因为他晚上玩太多的电脑。
However, he has poor eyesight because of too much computer work at night.
然而，他视力很差因为他晚上玩太多的电脑。
However, he has poor eyesight because of too much computer work at night.
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