【核心区别】
Periodic强调规律性循环,如钟摆运动;Sporadic则突出无规律随机发生,如火山喷发。
【语义特征】
1. Periodic:
-- 词源:希腊语"periodikos"(循环的)
-- 典型搭配:~ meetings(例会)/~ maintenance(定期维护)
-- 时间属性:可预测的间隔(如每季度/每28天)
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主题笔记
word-vs-word-cn
【Periodic】 means occurring at regular or predictable intervals.
- Lisa told us she would be having 【periodic】 performance reviews.
【Sporadic】 means occurring at irregular or unpredictable times.
- Some western states are experiencing 【sporadic】 power outages.