硬性规定购买物品to carry out fixed purchase

• 实行了31年的农产品统购派购制度被打破。

  The system of unified fixed purchase of agricultural products, in place for 31 years, has been dismantled.

• “双轨制”改变了实行三十多年的统购派购制度。

  The "two rail system" has changed the system of unified fixed purchases, in place for over 30 years.