... hardening 硬化 hardness of crystals 晶体硬度 hardness of water 水的硬度 ...
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At the same time, some of the same or higher hardness material, such as diamond, corundum, metal oxide, quartz crystals are likely to damage the material.
同时一些硬度相同或更高的物质,例如钻石、刚玉、氧化金属、石英水晶都有可能损坏这些材料。
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