adj.在夜間的；（指生物）夜間活動的
Stars are a nocturnal sight. 星星是夜間的景觀。
Ali was his principal attendant during this nocturnal survey. 阿里陪著他作這次夜間視察。
A nocturnal animal hunts its food at night. 夜間活動的動物在夜間獵食。
The dormouse is a shy, nocturnal creature. 榛睡鼠是一種在夜間活動的膽小動物。
