A few postcards and a letter were lying on the shelf.

VOA: special.2009.12.26

Tell me what you find on the shelf that sells for 20 cents a pound.

在售货架上,它们的价格达到了20美分每磅。

麻省理工公开课 - 固态化学导论课程节选

Tell me what you find on the shelf that sells for 20 cents a pound.

在售货架上,它们的价格达到了20美分每磅。

麻省理工公开课 - 固态化学导论课程节选