1Painstaking effort — working hard and racking one's brain to solve a problem or make something work, often used as 苦心する.
新しい製品を開発するために技術者たちは苦心を重ねた。
The engineers went through a lot of painstaking effort to develop the new product.
彼は資金不足を乗り越えるために苦心している。
He is struggling hard to overcome the lack of funds.
苦心の末、ついに納得のいく結果が出た。
After much painstaking effort, a satisfying result was finally achieved.
この作品には作者の苦心の跡がうかがえる。
You can sense the author's painstaking effort in this work.