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我在河边散步时突然有了一个好主意。
A good idea struck me while I was walking along the river.
youdao
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对不起，我那时正和朋友在河边散步。
Sorry, I was taking a walk with my friend along the river.
youdao
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一次，庄子和他的朋友在河边散步。
Once, Zhuang Zi and his friend were taking a walk along the river.
youdao