MNN is not limited by multiple classes.
MNN不受多类问题的限制。
To learn more about organic foods and farming, see the following articles from MNN.
欲知更多关于有机食品和农业的内容，请参照以下文章。
In order to obtain MnN, manganese power has been nitrided by nitrogen decomposed from ammonia at high temperature in pipe type oven at lab.
采用正交设计法，在实验室管式炉内、温条件下利用氨气分解产生的活性氮对锰粉进行氮化获得氮化锰粉。
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