unexplained
🇺🇸
/ˌʌnɪkˈspleɪnd/
🇬🇧
/ˌʌnɪkˈspleɪnd/
Something that has no clear reason or has not been described how it happened.
The unexplained noises during the night kept everyone awake.
夜晚无法解释的噪音让每个人都保持清醒。