以下为句子列表：
英文: Three methods for synthesis of mandelic acid were introduced in the article,and their advantages and disadvantages were compared.The method of mandelic acid synthesis using hypnone was selected,and flow chart and operation process were studied.
中文: 本文对扁桃酸常用的三种合成方法进行了介绍,对其工业化生产的优缺点进行了对比,最终选定了苯乙酮法,并给出了工艺流程图和操作步骤。
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