Most page elements have a boxy contour, so this variation will create some unique contrast.
许多页面元素都采用的是框式轮廓，因而这些变化会营造一些独特的对比效果。
The lateral inhomogeneity and the variation of density contrast with depth in the crust and their effects on the inversion of gravity field are discussed.
本文讨论利用重力资料反演莫霍面时，地壳横向不均一性，密度随深度变化以及异常数据滑动平均处理对解释结果的影响程度。
XPCI of low-absorption objects or little absorption variation objects showed some structure that could not be demonstrated in absorption contrast images.
对于低吸收物体或组织密度差异小的物体，位相对比成像显示出一些吸收对比成像所无法显示的组织结构；
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