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詞根pto來自希臘的pto意爲to fall。同義詞根有來自拉丁語的cid/cad/cas和laps。
symptomatic adj.征候的;(有)症狀的(一起掉下業的sym<syn(together) + pto (=fall))
symptom n.症狀;征候
Severe chest pain can be symptomatic of a heart attack or just simple indigestion.嚴重的胸痛可能是心髒病發作的征兆,也有可能衹是單純的消化不良。