sporadic
/spəˈɹæd.ɪk/ 形容词 C1中文： 零星、哩哩啦啦、偶尔发生的、无常
- Rare and scattered in occurrence.
- Exhibiting random behavior; patternless.
- Not belonging to any infinite family; an exception to an otherwise orderly classification.
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They had corresponded only through formal, sporadic letters, exchanging polite inquiries about historical context and obscure geographic peculiarities.
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