Hayley教口语，“寻根究底”用英语怎么说？

 get to the bottom of sth 

to discover the truth about a situation

对…寻根究底;找到…的真相

I'm not sure what is causing the problem, but I'm determined to get to the bottom of it.

我现在不能确定导致这个问题的原因是什么，不过我一定要弄个明白。

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