The third is the change in industry struc-ture from a pyramid to an hourglass shape as the really big schools become ever big-ger, squeezing the schools in the middle segment.

• 第三点，产业架构已从金字塔形演变为沙漏形，即两头大中间小。大型学校变得更大，压缩了中间市场学校的生存空间。