The poor quality of labor force is the main factor to restrict the transformation of surplus labor force in countryside.

农村劳动力素质低是制约我国农村富余劳动力转移的重要因素。

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The quality problems have become an important factor to restrict the spread of bar codes of commodity in our country.

商品条码的质量问题已成为制约我国条码进一步推广应用的重要因素。

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As convergence study place great emphasis on the long run trend of the regional economic growth, the key factor restrict the regional economic growth can be found more easily.

趋同研究关注区域经济增长的长期趋势及其影响因素，有利于发现制约区域经济增长的关键因素。

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But another key factor was the decision taken in the 1980s to restrict the use of powerful insecticides such as DDT and chlordane.

BBC: Bees on their knees while bed bugs boom