1
run across + [someone/something]
表示偶然遇到某人或某物，常用于口语。
I ran across an old friend at the market.
我在市场偶遇了一位老朋友。
跑着穿过；跑过
先理解核心含义，再看它在真实句子里的用法。
跑着穿过；跑过
To cross by running.
I ran across an old friend at the market.
我在市场偶遇了一位老朋友。
跑着穿过
To cross by running.
偶然发现；偶遇。
To find or discover by chance; to come across.
run across
Base
原形
runs across
3rd person
第三人称单数
running across
-ing
现在分词
ran across
Past
过去式
run across
Past participle
过去分词
I often run across old friends in the city.
我经常在城里偶遇老朋友。
She ran across the street to catch the bus.
她跑着穿过马路去赶公交车。
We have run across this problem before.
我们以前碰到过这个问题。
run across 为短语动词，动词 run 为不规则变化，across 保持不变。
I ran across an old friend at the market yesterday.
我昨天在市场偶遇了一个老朋友。
The children ran across the playground to get to the swings.
孩子们跑着穿过操场去荡秋千。
She ran across a rare book in the library while researching.
她在图书馆研究时偶然发现了一本罕见的书。
表示偶然遇到某人或某物，常用于口语。
I ran across an old friend at the market.
我在市场偶遇了一位老朋友。
表示跑着穿过某个地方，强调动作路径。
The dog ran across the field.
狗跑着穿过了田野。
Not this
I ran across with my teacher at the mall.
Use this
I ran across my teacher at the mall.
错误：在短语动词 run across 后错误添加介词 with（受中文‘偶遇某人’中不需要介词的影响）。改正后 run across 直接接宾语，表示‘偶遇’，无需额外介词。
Not this
I ran across the forest to get to the lake.
Use this
I ran through the forest to get to the lake.
错误：用 run across 表示‘跑着穿过森林’不自然，通常 run across 用于横穿道路或开阔区域（如 street, field），而穿过树林或密集区域应用 run through。run across 更常表示‘偶遇’。
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Use run across naturally, then get feedback on meaning, tone, grammar, and phrasing.
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作“偶遇”解时宾语须紧接 across，不可拆分；作“跑着穿过”解时 across 后接地点。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.