JLPT N1 Advanced
日夜
Day and night; constantly or around the clock.
Readings
Adverb, Noun
"Day and Night" / "Around the Clock"
Indicates a continuous state or effort that persists constantly regardless of the time.
Example
彼 は 新しい 薬 を 開発する ため に 、 日夜 研究 を 続けた 。
He continued his research day and night to develop a new medicine.
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