Glasses are, of course, an indispensable thing, but they worsen the sight.
视镜是必不可缺的，可是它们妨碍了视线。
She has good sight for a woman of 80, she never uses glasses.
对于一个80岁的妇女来说，她的视力是很好的，从不戴眼镜。
My sight isn't very good without glasses on.
我不戴眼镜的时候视力不好。
My sight isn't very good without glasses on.
我不戴眼镜的时候视力不好。
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