注：2007年起，造林总面积中增加无林地和疏林地新封山育林面积。
Note: Since 2007, area of afforestation include the area of no or spare with forests.
单是这个就可以证明封山育林效果有多好，如果知道他们可以发现多少有益的发明。
This alone should justify conserving forests, given how many useful discoveries they yield.
单是这个就可以证明封山育林效果有多好，如果知道他们可以发现多少有益的发明。
This alone should justify conserving forests, given how many useful discoveries they yield.
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