本文研究了硅酸钠在模拟铀矿坑水的石灰沉淀处理中的助凝作用。
The flocculation promotion of Na_2SiO_3 was studied in precipitation treatment for simulated uranium mine water.
化石是在50英尺深的石灰岩层里，它形成在大约百万年前由于海水泥沙沉淀物的堆积硬化。
The fossils were found in a seam of limestone that was 50 feet thick and was created when ocean sediments solidified millions of years ago.
凝灰岩是由石灰岩所组成，它是在其周围湖水里的碳酸盐矿物沉淀的副产品。
Made of limestone, tufa forms as a byproduct of the precipitation of carbonate minerals from surrounding water.
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