四个直辖市
Four municipalities directly under the central government
以上为机器翻译结果，长、整句建议使用 人工翻译 。
研究发现，经济发达的城市效率较高，如四个直辖市均达到DEA有效水平。
The study found that the more economically developed cities, the higher of the efficiency, such as the four municipalities have reached an effective level of DEA.
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