单词 | 粉块 |
释义 | 〔chalk〕A soft, compact calcite, CaCO3, with varying amounts of silica, quartz, feldspar, or other mineral impurities, generally gray-white or yellow-white and derived chiefly from fossil seashells. 白垩:一种松软的方解石粉块,CaCO3,含有不等量的硅石、石英、长石或其它矿物杂质,通常为灰白色或黄白色,从贝类化石中制得 |
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