词典释义：
双语例句
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This rock contained chalcedonic cement before it underwent diagenesis, a process where low temperatures and low pressures alter the content of sediments before they finally lithify, or turn into rock.
这块石头包含石髓的水泥之前，它经历了岩化作用，一个过程，那里的低温和低的压力，改变的内容，沉积物之前，他们终于岩化，或变成岩石。