n. 【地质学；地理学】均变说〔认为地质纪元中一切地质变化都可用浸蚀、沉积、火山作用等现有物理和化学作用来解释〕。
Uniformitarianism is the assumption that the same natural laws and processes that operate in the universe now, have always operated in the universe in the past and apply everywhere in the universe. It has included the gradualistic concept that "the present is the key to the past" and is functioning at the same rates.
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