这位地质学家用均变论观点解释了古代河流的沉积模式与现代相似。

The geologist used ___uniformitarian principles to explain how ancient river deposits resemble modern ones.

这位地质学家持有均变论观点，认为地球表面的变化主要是缓慢渐进的过程。

The geologist holds a ___uniformitarian perspective, believing Earth's changes occur mainly through gradual processes.