un·ex·plained
adjective/ˌʌnɪkˈspleɪnd/
/ˌʌnɪkˈspleɪnd/
- 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
- …
- an unexplained mystery