❶sudden or abrupt change ❷leap;mutation 国际形势的～abrupt change of the international situation/风云～，军阀重开战。(毛泽东词《蒋桂战争》) Sudden veer of wind and rain.The warlords fight again.(Mao Zedong’s poem The Warlords Fight)/在认识上从渐变到～from a gradual change to a leap in the process of cognition/自发～spontaneous mutation