三北防护林
sān běi fáng hù lín
释义
- 1. Green Wall of China, a massive afforestation program on the eastern margin of the Gobi Desert aimed at stopping the desert's expansion, started in 1978 and planned to be completed by 2050
流利来自习惯。
改变你的学习方式。
试试 HanyuGuide 的主动间隔重复系统。
