But the principle of focusing rays through an aperture onto a two-dimensional surface remains the same.

但其原理通过孔径聚焦光线在一个二维表面是保持不变的。

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Years of focusing on close, two-dimensional work causes most children to become at least slightly nearsighted by the age of 10, say the researchers.

研究者表示，多年的近距离的、二维的课业使绝大多数孩子在10岁之前至少是轻度近视。

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