以下为句子列表：
英文: A gradient is a smooth transition from one color to another. In addition, several color transitions can be applied to the same element.
中文: 渐变是自一种颜色到另一种颜色的逐渐过渡。另外，多个颜色渐变可以应用到相同的元素上。
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英文: A gradient of 1 in 4 is a rise or fall of one metre for every four metres forward.
中文: 四分之一的坡度是每前进四公尺升高或下降一公尺。
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英文: A type of small-sized interferometer is reported, which makes use of the coupling of optical fiber and gradient index lens (GRIN) to form parallel light beams.
中文: 摘要介绍一种超小型光纤导光干涉仪，它利用光纤和自聚焦透镜的耦合来形成平行光路，利用半反和全反光学膜片分光。
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英文: A white needle crystal was isolated and purified on systematic extraction of the alkaloid by silica gel column and gradient sublimation from Oxytropis glabra.
中文: 摘要采用生物堿系统提取、矽胶柱层析分离及梯度升华技术从小花棘豆干草粉中分离出一种白色针状结晶。
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英文: Abstract: It is found through theoretical analysis that,heat-lens effect arises only when the light is birefracted in photorefractive crystals.It is also point out that the lateral anisotropic temperature gradient is only one cause causing the heat-lens e
中文: 文摘:通过对光折变晶体的热透镜效应的理论分析发现，光通过光折变晶体时，只有在晶体发生双折射的前提下，才能发生热透镜效应.并指出，晶体内存在的由热效应引起的横向各向异性温度梯度仅是产生热透镜效应的一个方面，而“光阻”则是产生光折变晶体热透镜效应的另一个原因，从而丰富了光折变效应的内涵.
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