The performances of modern colour-difference formulae were investigated to evaluate very small colour difference at human eyes threshold level based on object surface colours.

基于物体表面色样本的视觉评价，测试常用色差公式在人眼阈值水平的微小色差预测性能。

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Another ring for the difference between the base-level, allowing the ferrule at the base of the non-standard technology of surface markers.

为区别另一套圈的基准面，允许在该套圈的的非基准面上标工艺标志。

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The difference is mainly represented as the surface and the deeper levels of comprehension, or the explaining level and the researching level.

这种理解分歧主要表现为表层和深层两个层次，即解释的层次和研究的层次。

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The torpedo-shaped instrument gathers data about the difference between the level of the seawater beneath the ice and the surface of the ice itself.

BBC: Arctic ice melting at 'amazing' speed, scientists find