for which the reason or cause is not known; that has not been explained 原因不详的;未解释的;未说明的 an unexplained mystery 解释不清的奥妙 He died in unexplained circumstances. 他死因不明。 The reason for her strange behaviour remained unexplained. 她怪异行为的原因还是个谜。
Oxford Collocations DictionaryUnexplained is used with these nouns:- absence
- death
- disappearance
- …