unexplained

剑桥词典

Unexplained events , behaviour , etc. are ones for which people do not know or understand the reason .
（事件、行爲等）未說明的，未解釋的，原因不詳的
an unexplained death /noise 原因不明的死亡／噪聲
He was shot dead earlier this year in unexplained circumstances . 他在今年早些時候莫名其妙地被人開槍打死了。 返回 unexplained