以下为句子列表：
英文: In general, smaller grain size and greater angularity tend to increase the porosity while an increase in range of particle size tends to decrease porosity.
中文: 通常，颗粒越小曲率越大孔隙度越大，而当颗粒尺寸增大时孔隙度会减小。
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英文: The striated marks on the curve part of magazine are the marks formed by the friction between shell cases and the inner angularity of magazine's curve part during the process of bullet installation.
中文: 摘要弹匣弧形部擦划痕迹是射手在以压推方式向弹匣内压装枪弹过程中，弹壳体与弹匣弧形部内边棱相摩擦而形成的痕迹。
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