求翻译：本文通过对DL-丝氨酸用途、传统合成路线筛选确定了以亚甲氨基乙腈和多聚甲醛为原料制备DL-丝氨酸，并且通过正交试验确定工艺路线，操作简单，成本较低。分析检测得到两步反应总产率达61.8%，纯度为60%。是什么意思？

Based on the use of DL-serine, the traditional synthetic route screening to determine the methylene amino acetonitrile, and paraformaldehyde as raw material DL-serine, and determine the process by orthogonal lines, simple operation, low cost. Analysis has detected two-step reaction rate of 61.8% of

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This article through to the DL- serine use, tradition process of synthesis screening had determined prepares the DL- serine take the Asian armor amino second grade nitrile and the paraformaldehyde as raw material, and through the orthogonal experiment definite craft route, the operation is simple, t

Purpose of this article by DL-serine, traditional route filter to determine the synthesis of methylene amino acetonitrile and paraformaldehyde as raw material preparation of DL-serine, and through orthogonal test to determine the route, simple operation, low cost. Get two step response output on ana

This text through to use of DL and serine and tradition formate route screen confirm regard inferior A amino B nitrile and much polyformaldehyde as raw materials prepare DL - serine, and determine the craft route by orthogonal test, easy to operate, the cost is relatively low. Analyze detect get rea