American college students are expected to state their main idea at the beginning of the paper.

VOA: special.2009.04.30

The idea of bridging Ivory tower and Main Street.

也就是，搭起学校与社会之间的桥梁的想法。

哈佛公开课 - 幸福课课程节选

"The original idea for Stockbridge at Christmas was actually conceived in 1956,'57 when Hallmark card corresponds with Rockwell on the idea of an image of an American main street which will symbolize Christmas in America,"

VOA: standard.2009.12.25