happen upon
美英
- na.偶然看到
- 网络偶然发现;碰巧碰上;偶然遇到,偶然找到
第三人称单数:happens on 现在分词:happening on 过去式:happened on
![happen upon](../cache/526655.jpg)
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第三人称单数:happens on 现在分词:happening on 过去式:happened on