sudden changes短语⁴²⁴³⁵ 基本例句 🌏突然变化 These species are believed to have disappeared because of natural causes, such as sudden changes in climate, competition with other species or catastrophic events such as earthquakes and volcanoes. 这些物种因为自然原因而被认为已经消失，这些原因包括诸如气候突变、与其他物种的竞争或像地震、火山爆发那样的灾难性事件等。 depv