unexplained

剑桥词典

Unexplained events , behaviour , etc. are ones for which people do not know or understand the reason .
（事件、行为等）未说明的，未解释的，原因不详的
an unexplained death /noise 原因不明的死亡／噪声
He was shot dead earlier this year in unexplained circumstances . 他在今年早些时候莫名其妙地被人开枪打死了。 返回 unexplained