obscure reason

不明原因：指不为人所知或不易理解的原因或动机。
常用释义
不明原因：指不为人所知或不易理解的原因或动机。

例句

Archer understood that he ran the risk of having his mandate withdrawn, and for some obscure reason he disliked the prospect.

阿切尔明白他在冒被收回成命的风险。由于某种说不清的原因，他并不喜欢那种前景。