Sporadic
1680s, from Medieval Latin sporadicus "scattered," from Greek sporadikos "scattered," from sporas (genitive sporados) "scattered, dispersed," from spora "a sowing". Originally a medical term, "occurring in scattered instances;" the meaning "happening at intervals" is first recorded 1847.
Sporadic 一词源自希腊语 spora （种子、播种），与英语单词 spore （孢子）同源。
自然条件下植物的种子随风传播（如蒲公英）或附着经过的动物传播（如苍耳），后代可能分散在不同地方。这个景象可以帮助理解 sporadic 的“分散”之意；上面的词源引文则说明，它最初用于医学，指病例零星出现。
——收入 词语的化石层