Second, pay attention to surface weathering degree.

第二，注意表面风化程度。

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The beads of color clear, shiny and moist, clear lines of natural, mellow and delicate texture, a certain degree of surface weathering pattern, thick patina.

该天珠为，色泽分明、油亮润泽，纹路清晰自然、质感细腻圆润，表面有一定程度的风化纹，包浆厚重。

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He added, however, that in order to make even more progress in determining how Venus resurfaces, scientists need to learn exactly how weathering surface rates affect emissivity.

然而，他补充道，还需要在确定金星地表如何重塑这个问题做出更多的努力，科学家需要确切地了解地表风化率如何影响辐射率。

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Drilling a few centimetres inside a rock provides a fresh sample that is free from the alteration that can occur at the surface as a result of weathering or radiation damage.

BBC: Curiosity Mars rover hammers into rock