以下为句子列表：
英文: A formula is proposed for calculating the sand content of different size in the case of matching particle size of sand, thus obtaining the correlation between ultrasonic attenuation and density of solid particles in the pulp, as well as particle size.
中文: 提出了在矿砂粒径尺寸级配情况下的不同粒径时的矿砂含量的公式，并由此得到了超声波衰减与矿浆中固体颗粒浓度、粒度之间的关系。
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英文: Based on the radio waves propagation models of circular tunnels and rectangular tunnels, the relation between attenuation and conductivity is analyzed and the concept of conductivity breakpoint is presented.
中文: 根据圆形巷道和矩形巷道的电波传播模型，分析了电波衰减率和电导率的关系，并且提出了电导率断点的概念。
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英文: Comparisons between the acoustic performances of the air cleaners with and without filter paper illustrated that the acoustic attenuation performance has been improved due to the existence of filter paper.
中文: 通过比较不带滤纸和带有滤纸的空气滤清器的声学性能结果表明，滤纸的考虑与否对空滤器的中高频消声性能有很大影响。
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英文: Diffuse and specular lighting calculations take the lights direction, but not its actual position, into account, and attenuation is disabled.
中文: 人和昵称都很老了)翻译是对的，反射光散射光的计算只考虑方向不考虑其实际位置，并且不考虑衰减。
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英文: Does this look like what is required for the distance attenuation calculation.
中文: 计算距离衰减值的时候要用使用到它。
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