以下为句子列表：
英文: A thirty year old listener in Vietnam says he can not see well and doctors have told him he has retina (retinal) degeneration .
中文: 越南一位三十岁的听众说他看东西很模糊，医生说他已经得了视网膜坏死症。
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英文: A unit of retinal illumination, equal to the amount of light that reaches the retina through 1 square millimeter of pupil area from a surface having a brightness of 1 candela per square meter.
中文: 光度视网膜亮度单位，相当于每平方米有一烛光亮度的表面，通过一平方毫米的瞳孔区域，到达视网膜的光线数量
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英文: As a result, the retina can begin to self-destruct.
中文: 这将导致视网膜开始自毁。
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英文: Because the threshold exposure levels for photic damage to the retina at each wavelength of the optical spectrum are well known, it is fairly simple to calculate the maximum permissible filter transmittance that will provide adequate retinal protection fr
中文: 由于每种波长光线的极限值都已被测定,所以要计算出安全太阳滤镜最高允许透光率是很容易的.
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英文: Comparison of biological effect of pulsed dye laser irradiation on the retina at different wavelengths
中文: 不同波长脉冲染料激光照射视网膜的生物效应比较
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