JLPT N1
～に～を重ねて（に～をかさねて）
through repeated/continuous (effort, work, etc.)
Structure / Usage
Noun + に + Noun + を重ねて
Example Sentences
研究に研究を重ねて、ついに新薬を開発した。
Through repeated research, they finally developed a new drug.
議論に議論を重ねた結果、結論が出た。
After extensive discussion upon discussion, a conclusion was reached.