他突然抽搐发作，身体剧烈痉挛起来。

He suddenly had a ___convulsion and his body jerked violently.

战争引发了整个地区的剧烈动荡。

The war triggered a violent ___convulsion across the entire region.

听到这个消息时，她突然控制不住地抽泣起来。

Upon hearing the news, she broke into uncontrollable ___convulsions of tears.