交换原理即心理第四原理，是心理五原理之一。交换原理阐述样本的产出机制，阐述样脑各层次结构（神经元、神经元群、核团或功能区、脑）的功能，是根据经典神经元学说、经典反射理论接合大量的实验研究资料，深入研究，经过长达数年的反复验证，证实神经元具有交换信息的功能，为揭开意识、心理奥秘打下了坚实基础。
根据泥沙交换原理，对河床变形计算方法进行了若干改进。
On the basis of mechanism of sediment exchange, some improvements in relation to the calculation method for river-bed deformation are performed.
根据空气与岩体的热交换原理，探讨了利用浅部地层调温作用来降低深井入风温度的可行性。
Based on the heat exchange theory between air and rock, the feasibility of decreasing air inlet temperature by temperature regulating action of shallow ground is discussed.
基于热质交换原理，设计了一种新型的过热蒸汽饱和器，用于热质交换设备中过热蒸汽的饱和化。
Based on the principle of heat and mass exchange, a new type of superheated steam saturator is designed.
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