converting cropland to foresfland project

• 退耕还林

converting cropland to foresfland project的用法和样例：

例句

1. The program of the converting farmland into forest is a big systems engineering,which involes broad converage, invests much money and has high participation of farmers.
   退耕还林是一项庞大的系统工程，覆盖面广，投资多，农民参与程度高。