开垦处女地

例句：

1. 1. The farmers have been workinghard to open up the new farmland.
   农民们一直在努力开发新的农田。
2. 2. Thegovernment has been investing heavily in cultivating renewable energy sources.
   政府一直在大力投资于可再生能源的开发。
3. 3. The scientist has beenstudying the effects of tilling on soilfertility.
   科学家一直在研究耕作对土壤肥力的影响。