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随着人类医学的飞速发展和计划免疫工作的大力开展，一些严重威胁小儿健康的感染性疾病和营养小良性疾病正在逐渐减少和得到基本控制，而某些先天性和遗传代谢性疾病将成为影响人口健康素质的主要因素。其中如：苯丙团尿症就是引起小儿智能低下的重要原因之一。因此，需要从新?
With the rapid development of human medicine and the planned immunization work, some infectious diseases and minor benign diseases that pose a serious threat to children’s health are being gradually reduced and basically controlled. Some of the congenital and genetic metabolic diseases will be affected The main factor of population health quality. One such as: phenylpropanal urinary tract disease is one of the important causes of mental retardation in children. So, need new?