以下为句子列表：
英文: This method, however, involves using a large excess of diethyl carbonate (for example, 4-8 mols.); it also involves preparing sodium ethylate by dissolving sodium metal in ethanol, which process must be carried out very slowly and carefully if it is to be
中文: 但是这一方法涉及到使用大量过量的二乙基碳酸酯（例如，4-8摩尔）；同时也涉及到在乙醇中溶解纳来制备乙醇纳的反应，这个过程必须非常缓慢小心地进行，如果在工业生产级别上是用这一方法就比较麻烦了。
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