她的突然失踪对我们所有人来说仍然无法解释。

Her sudden disappearance remains ___inexplicable to us all.

他感到一种难以理解的冲动，想要去看看那栋老房子。

He felt an ___inexplicable urge to visit the old house.

双胞胎之间的联系有种难以言喻的东西。

There's something ___inexplicable about the bond between twins.