加入左旋氮甲基精氨酸 L-NMA ; L-NG-monomthyla ryinine
用过的咖啡渣，通过适量地在土壤中加入氮来对花园产生好的作用。
Used coffee grounds, in moderation, can do wonders for the garden by adding nitrogen to the soil.
他们将容器充满由蒸发液态氮和液态氧得到的纯空气，再加入水蒸气和一些痕量气体。
They fill the container with pure air made by evaporating liquid nitrogen and liquid oxygen, and add water vapour and some trace gases.
因为一般的测定动物食物的测试只测量其中氮的含量，这些化学物质可以被加入昂贵的食物成分中而不为人所知。
Since the usual test for protein in animal feed just measures the level of nitrogen, these chemicals can be added to far more expensive feed ingredients without anybody noticing.
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