“剧变”用英语怎么说？

政治进程中的剧变a seismic shift in the political process一股强冷空气前锋周三使堪萨斯的天气发生了剧变。A very active cold front brought dramatic weather changes to Kansas on Wednesday.古娟的感情开始剧变, 她那么彻底地毁了生活.There started a revulsion from Gudrun, she fin...