身體的抽搐
被搖的就是一個人的身體，這是最原本的畫面。
noun · C1
A sudden shaking of the body that a person cannot control, caused by illness. The muscles tighten and jerk hard, and it usually passes after a short time.
抽搐；痙攣
核心畫面
One way to picture convulsion: something gripped and shaken hard from the inside, jerking in , with nobody able to hold it still. The first thing shaken is a sick person's body. the same picture and the thing shaking can be a country, the ground under it, or a room full of people who cannot stop laughing.
convulsion 可以想成一個東西被從裡面抓住猛搖，一陣一陣地抽，誰也按不住。最原本被搖的是生病的人的身體。把同…更多收起
convulsion 可以想成一個東西被從裡面抓住猛搖，一陣一陣地抽，誰也按不住。最原本被搖的是生病的人的身體。把同一個畫面放大，被搖的就換成別的東西：換成一個國家，就是政治社會整個動盪；換成腳下的地和外面的海，就是地在震、浪在翻；換成一屋子笑到直不起腰的人，就是停不下來的大笑。每一次都是同一件事——動得很猛，而且沒有人喊得停。From the word’s history
Wiktionary gives Latin convulsio, from the verb convello. The packet does not gloss that Latin verb, so the link between the Latin root and the shaking picture is left here as a suggestion rather than a claim.
Wiktionary 記錄這個字來自拉丁文 convulsiō，動詞形是 convellō。packet 沒有給出那個拉丁動詞的字義，所以這裡只把「猛力扯動」的畫面當成一個好記的想法，不當成已證實的詞源說明。
Wiktionary entry 'convulsion' (kaikki extract, source_ref kaikki:3f6f69a190036ae4:458880574:16673); etymology_text supplied in this packet reads: From Latin convulsiō, from convellō.
Three branches
大局被猛烈搖動
被搖的從一個人的身體，換成一個國家、一片土地、一個大體系。
noun · C1
A great and violent change that shakes a whole country, such as a sudden change of government or a long period of unrest. It is usually used in the plural.
動盪；劇變
笑到停不下來
身體還是那個抖到停不住的身體，只是這次的原因是笑，不是病。
noun · C1
If people are in convulsions, they are laughing so hard that their whole body shakes and they cannot stop.
笑到不行