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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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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Therefore, it is necessary to use social right factor to restrict administrative power.

在这种情况下，应该调动社会权力的因素来达到制约行政权的目的。

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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