突然发生
近义词与同义词
按词义分组列出，使用时请结合具体语境。
appear suddenly or unexpectedly; "The farm popped into view as we turned the corner"; "He suddenly popped up out of nowhere"
start abruptly; "After 1989, peace broke out in the former East Bloc"
appear suddenly; "Spring popped up everywhere in the valley"