From the scope of the effect, include nation, region and globe three levels.
从影响的范围上看，涉及国家、地区、全球三个层面。
The method has wide application scope, simple structure, and good energy-saving and emission-reduction effect.
本方法适用范围广，结构简单，减排、节能效果好。
The method has wide application scope, simple structure, and good energy-saving and emission-reduction effect.
本方法适用范围广，结构简单，减排、节能效果好。
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