the eco-compensation theory of mechanism and empirical study 海洋保护区生态补偿机制理论与实证研究：the eco-compensation theory of mechanism and empirical study Employment：a theoretical and empirical study a research based on the theoretical and empirical study 并列题名：Employment：a theoretical and empirical study Oil prices:theoretical and empirical study theoretical mechanisms and empirical testing theoretical basis and empirical study theoretical reflection, occurrence mechanism and empirical verification Microscopic urban carbon emission theory, method and empirical study