氮中二氧化碳和空气中甲烷气体标准物质属于标准混合气。
The two gaseous Reference Materials, Carbon dioxide in nitrogen and methane in air, belong to standard mixed gases.
生产如此数量的粮食可能大大提高环境中二氧化碳和氮的水平，引起很多物种的灭绝。
Producing that amount of food could significantly increase levels of carbon dioxide and nitrogen in the environment and cause the extinction of numerous species.
理论上，大气中二氧化碳含量增多会使作物生长加快，实际上，还要看土壤中所含氮成分的多少。
In theory extra carbon dioxide in the atmosphere should help plants grow faster, though whether this actually happens may also depend on the amount of nitrogen in the soil.
理论上，大气中二氧化碳含量增多会使作物生长加快，实际上，还要看土壤中所含氮成分的多少。
In theory extra carbon dioxide in the atmosphere should help plants grow faster, though whether this actually happens may also depend on the amount of nitrogen in the soil.
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