The past papers assuming consumer income to be evenly distributed use duopoly model for analyzing the impact on the social welfare caused by price ceiling.

以往文献在均匀分配假定下探讨价格上限对市场结构和社会福利的影响。

youdao

The papers keep trying to dredge up details of his past love life.

这些报纸老是翻出他以往爱情生活的琐事。

《牛津词典》

It is not permitted to sell or otherwise distribute copies of past examination papers.

不准出售或以其他方式散发过去的试卷。

《牛津词典》

Esther practised on past papers and took the exam in a private room in the secondary school, monitored by three examiners and her mother.

BBC: Six-year-old Wolverhampton girl awarded maths GCSE

Kerry is the second Democrat to make such a move, joining Vermont Gov. Howard Dean who filed papers this past spring.

CNN: Kerry files papers for presidential committee

But in the past few days you've already had the papers digging up things from his past in exactly the way they do in my novel.

BBC: A Very British Coup 35 years on