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确保你的窗户干净，没有任何挡住光线的东西。
Make sure your Windows are clear of anything that impedes the light.
youdao
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玻璃体出血混浊会挡住光线，引起视力模糊。
Vitreous hemorrhage turbidity will block the light, caused blurred vision.
youdao
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挪动一下好吗？你挡住我的光线了。
Could you move—you're in my light.
《牛津词典》