adj.在夜间的；（指生物）夜间活动的
Stars are a nocturnal sight. 星星是夜间的景观。
Ali was his principal attendant during this nocturnal survey. 阿里陪着他作这次夜间视察。
A nocturnal animal hunts its food at night. 夜间活动的动物在夜间猎食。
The dormouse is a shy, nocturnal creature. 榛睡鼠是一种在夜间活动的胆小动物。
