... 蚀变辉石 hectorite 地表蚀变 surface alteration 后期蚀变 paulopost alteration ...
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laser alteration of material surface 材料表面激光改性
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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
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