首先，这些肥料的生产成本高，要知道合成氨的生产过程所使用的能量占世界全部消耗的2%，含磷矿石的开采正在日益加剧地球上有限资源储量的衰竭。
They're costly to make, for one, since the production of ammonia now accounts for roughly 2 percent of global energy use, and mining for phosphorus is depleting the planet's finite reserves.
另一方面，通过加强对物料的温度控制，可以减少能量的浪费，降低生产成本，提高挤出效率。
On the other hand, by improving the control of the melt temperature, it can distinctly reduce the waste of energy, pull the cost down and enhance the efficiency of extrusion.
矿井排水设备消耗的电能占矿井总耗能量的比重很大，其运行经济性对矿井生产成本具有重要影响。
The electricity of coal mine main pumping equipment consuming constilute important statute, its economic operation has important effects to mine production costs.
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