以生态学理论为指导，模拟自然生态系统，改善生态环境的系统工程。包括绿化、美化环境，改善大气质量、水质等ecological engineering

• 搞生态工程、搞生态设计是很必要的。

  It is very necessary to carry out ecological engineering and design.

• 在水土保持生态工程建设中要处理好小流域治理和大面积恢复植被的关系。

  In establishing ecological engineering projects to retain soil and water, one must handle the relationship between tackling minor watersheds and restoring vegetation cover over wide areas well.