| 单词 | hardness |
| 释义 | Word Frequency hardness(ˈhɑːdnɪs) noun 1. the quality or condition of being hard 2. one of several measures of resistance to indentation, deformation, or abrasion Mohs scale, Brinell hardness number 3. the quality of water that causes it to impair the lathering of soap: caused by the presence of certain calcium salts. Temporary hardness can be removed by boiling whereas permanent hardness cannot |
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