经济效益为一定的社会经济关系所制约。
Economic efficacy is influenced by the social economic relations in a specific society.
中国传统桥梁的历史、地理和社会经济关系研究；
The relationship of the history, geography and economy of Chinese traditional bridges.
中国传统桥梁的历史、地理和社会经济关系研究；
The relationship of the history, geography and economy of Chinese traditional bridges.
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