分析了林、草在沙区生态环境中的作用及如何进行还林还草；

Then, the action of restoring forest or grass and its method are analysised.

youdao

分析了林、草在沙区生态环境中的作用及如何进行还林还草；

Then, the action of restoring forest or grass and its method are analysised.

youdao