本病最基本的生化缺陷尚不清楚。

Its basic biochemical defect is still unclear.

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结论以上3种生化指标联合检测为产前诊断严重胎儿缺陷的有效方法。

Conclusion: the 3 maternal serum markers may become an effective method for prenatal screening of the important fatal defects.

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在经济增长理论研究中，新增长理论克服古典增长理论中技术为外生因素的缺陷，把技术进步内生化。

New Growth Theory has made technological change endogenous, overcoming the flaw of exogenous technology in the Neoclassic Growth Theory.

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