1.  day and night
2.  round the clock

• 1. 昼夜: Day and night | Night And Day
• 2. 云帆高张，昼夜星驰: sailed the oceans day and night
• 3. 日月不同光，昼夜各有宜: "The sun and the moon shine in different ways; yet their brightness is just right for the day and the night respectively."

更多释义

• 1.理论上，我不分昼夜随叫随到。
  In theory I'm on call day and night.
  dict.yoduao.com
• 2.敌人昼夜不停地狂轰滥炸。
  The enemy kept up the bombardment day and night.
  dict.yoduao.com
• 3.她以为她可以不分昼夜随时给我打电话。
  She thinks she can call me at all hours of the day and night.
  dict.yoduao.com

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