唯有完成艰难的工作才有进步。

Welcome difficult assignments. Progress lies in accomplishing difficult work.

youdao

那是一项艰难的工作，但我们还是完成了。

It was a difficult task but we brought it off.

《牛津词典》

他们不需要解决预算问题、教育孩子、一起清理厨房或完成任何一项艰难的工作。

They didn't have to work out budgets, discipline kids, clean up the kitchen together, or do anything hard.

youdao