Occurred
“Occurred” 表示某事在某一时间或情境下发生，主语多为事件或变化，如 “The accident occurred at noon.”（事故发生在正午。）固定搭配 “It occurred to me that …” 表示“我突然想到……”。
- “A power outage occurred during the storm.” (暴风雨期间发生了停电。)
- “The meeting occurred online instead of in person.” (会议改在线上举行，而非现场。)
- “It occurred to her that she had left the keys inside.” (她突然想起钥匙落在屋里了。)
“Occur” 来自拉丁语 occurrere，由 ob-（朝向）与 currere（跑）构成，字面义“跑向、迎面而来”，引申为“发生、出现”。
oc-（朝向）+ cur（跑）+ -ed；名词 occurrence（发生、事件）同族。
正式报告与新闻多用 occurred 描述事故、错误与历史事件；学术写作中避免与 happen 混用时，occur 更偏书面。
- 原形: occur
- 现在分词: occurring（需双写 r）
- 名词: occurrence
- 固定搭配: “occur to someone” (某人突然想到), “frequently occurred” (频繁发生)
cur 像“跑”过来：事情 occur（发生）= 跑到眼前 → occurred 已经发生过了。
“No one noticed when the error occurred, until customers reported missing charges.” (直到客户反映扣款异常，才有人注意到错误是何时发生的。)