According to gradient theory early-developing regions should have mass transfer from early-developing regions to late-developing regions, but it does not happen as expected.
按照区域梯度理论应该发生的先发区域边际产业向后发区域的大规模转移，却没有按照预期的发生。
Based on turbulent diffusion theory and the mechanism of liquid-gas interfacial mass transfer, a conceptual model of turbulent re-aeration process is proposed.
本文根据紊动扩散理论及气液界面质量传递过程，提出了紊动水体复氧过程的概化模型。
Double film theory shows that the mass transfer outside the droplets is the controlling step.
通过双膜理论分析得知，滴外传质是萃取过程的控制步骤。
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