dì / zhì / xué / jiā / céng / jīng / yòng / zāi / biàn / shuō / jiě / shì / wù / zhǒng / de / dà / guī / mó / miè / jué

地质学家曾经用灾变说解释物种的大规模灭绝。

Geologists once used catastrophism to explain the mass extinction of species.