不分昼夜

Traditional form:

不分晝夜

Pinyin (reading):

bùfēnzhòuyè

Definitions:

• day and night
• round-the-clock

Characters:

• 不 - no, not, un-; negative prefix
• 分 - to divide, to allocate; fraction; small unit of time or other quantity
• 昼 - daytime, daylight
• 夜 - night, dark; under cover of night

Traditional characters:

• 不 - no, not, un-; negative prefix
• 分 - to divide, to allocate; fraction; small unit of time or other quantity
• 晝 - daytime, daylight
• 夜 - night, dark; under cover of night