土壤水蚀是一个复杂的物理化学过程。
破碎是煤燃烧过程中的一个复杂的物理化学过程。
Coal particle fragmentation represents a complicated physicochemical process during the combustion of coal.
污垢的形成是一个复杂的物理化学过程，影响因素众多。
Fouling is a physical and chemi complicated process which is influenced by many factors.
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