the whys and wherefores
understand the whys
the whys of it
A: Do you know the whys of his behavior?
A：你知道他行为背后的原因吗？
B: No, I'm still trying to find the whys.
B：不知道，我还在试图找出原因。
1) 原因
2) 理由
3) 解释
1. 原因，理由
noun
1. The reasons or causes for something.
Synonym: reasons, causes