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cad,cid,cas
fall 落下，降临

decadent adj.颓废的
de-cad-ent de-:向下；cad：落；-ent：…的

accident n.意外事件
ac-cid-ent ac-：to；cid：降临；-ent：名词后缀--->”突然降临的事“

casual adj.偶然的；临时的
cas-ual cas：降临；-ual：形容词后缀

Do you recall any words you know that consist of the root "cad,cid,cas"?
Welcome to write them down here and try to analyze the words structurally.

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