The three most important nutrient recycles are the nitrogen cycle, the carbon cycle and the one we are going to talk about today, the Phosphorus cycle.
这三种最重要的营养循环包括氮循环、碳循环和我们今天要讲的磷循环。
You said that the nitrogen cycle is also an important nutrient cycle.
你说了，氮循环也是一个重要的营养循环。
No Dickensian insights are necessary to appreciate the scale of human intervention in the nitrogen cycle.
在理解人类对氮循环的干扰力度方面，并非是杞人忧天。
There would be nowhere near as many people doing all sorts of other things to the planet if humans had not sped the nitrogen cycle up.
如果人类没有加速氮循环的速度，那么就远不会有众多人对地球上做其他的各种事情。
It is also worth noting that unlike many of humanity's other effects on the planet, the remaking of the nitrogen cycle was deliberate.
还值得注意的是，与地球上其他人类的影响不同，对于氮循环的再改造是故意的。
So too is the nitrogen cycle, which converts pure nitrogen from the air into useful chemicals, and which mankind has helped speed up by over 150%.
氮循环也一样，它将空气中的纯氮转化成有用的化合物，而人类使其加速了150%以上。
What seems certain is that the nitrogen cycle is changing faster and more profoundly than the carbon cycle, which has attracted much more attention.
显而易见的是，「氮循环」比「碳循环」更可怕，变迁得更快，影响也更广泛，不过大家比较关心的却还是「碳循环」。
One crucial part of this cycle-the fixing of pure nitrogen from the atmosphere into useful nitrogen-containing chemicals-depends more or less entirely on living things (lightning helps a bit).
氮循环的一个关键组成部分就是——在大气中，将纯净的氮固定为成含氮化合物的形式——这或多或少要完全依赖于生物(闪电仅起一点儿作用)。
The results from reservoir simulation indicated that it is reasonable to inject nitrogen first and then steam at late steam soaking, and there exists an optimum nitrogen volume in a injection cycle.
模拟研究表明，在吞吐后期宜采取先注氮气、后注蒸汽的注入方式，并且存在一个优化的周期注氮量。
The DPM method needs lot of field data, mainly to study nitrogen cycle in field, assess water and nitrogen usage efficiency and optimize management soil water and nitrogen fertilizer.
动力学模型需要大量的田间实测资料，主要应用于农田氮素循环、定量评价水氮资源利用率、优化水肥管理措施等方面。
The process of naked cooling with nitrogen cycle refrigeration was proposed according to the producing requirement, followed by some points to note during the naked cooling process.
根据生产需要，提供了利用氮气循环制冷实现空分设备裸冷的工艺方法，分析了实施过程中的注意问题；
Thermodynamic computation results showed that the specific work output of liquid nitrogen in the new cycle was 129% more than that in the single Rankine cycle.
计算结果表明，液氮在所设计的热力循环下的比输出功比采用单级朗肯循环提高了129%；
The indirect combined cycle, which consists of a steam cycle and a nitrogen gas turbine cycle with a pre-cooler, could be the first choice.
由蒸汽循环和带有预冷器的氮气透平循环构成的间接联合循环可以作为首选方案。
Analysis shows that more nitrogen is oxidized by ammonia oxidizing bacteria(AOB) than by nitrite oxidizing bacteria(NOB) with more growth of the AOB than the NOB in each cycle when using this method.
结果表明：利用曝气时间实时控制，在每个周期内氨氧化菌（AOB）降解氨氮质量大于亚硝酸盐氧化菌（NOB）降解亚硝态氮质量；AOB的净增数量大于NOB净增数目。
Analysis shows that more nitrogen is oxidized by ammonia oxidizing bacteria(AOB) than by nitrite oxidizing bacteria(NOB) with more growth of the AOB than the NOB in each cycle when using this method.
结果表明：利用曝气时间实时控制，在每个周期内氨氧化菌（AOB）降解氨氮质量大于亚硝酸盐氧化菌（NOB）降解亚硝态氮质量； AOB的净增数量大于NOB净增数目。
Analysis focuses on the reason for impurity concentration in closed-cycle nitrogen-water precooling system of air separation unit. The solution to this problem is also presented.
分析了空分设备闭式循环氮水预冷系统杂质浓缩的原因，提出了处理措施。
Simple solvent recovery unit, a high recovery rate, flammable, explosive, toxic and easy oxidation of materials can be used as a nitrogen gas containing a closed-cycle wet, so that the safe operation.
溶剂回收装置简单，回收率高，对于易燃、易爆、有毒和易氧化的物料，可用氮气作为载湿气体进行闭路循环，使之安全操作。
Simple solvent recovery unit, a high recovery rate, flammable, explosive, toxic and easy oxidation of materials can be used as a nitrogen gas containing a closed-cycle wet, so that the safe operation.
溶剂回收装置简单，回收率高，对于易燃、易爆、有毒和易氧化的物料，可用氮气作为载湿气体进行闭路循环，使之安全操作。
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