在一个偶然的机会下 Under the one by chance ; A chance in the next
偶然机会下
By chance
以上为机器翻译结果，长、整句建议使用 人工翻译 。
然而，一次偶然的机会下，男孩们打了起来，水壶也掉进了井里。
Once there, though, the boys began to fight and the water jug fell into the well.
youdao
偶然[的机会下，人们发现了]用方程库进行工作的第二优势。
There was a serendipitous second advantage to working with a library of equations.
只是在一个偶然的机会下被他们给捡到的！
I was just picked up by them by chance!
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