通过分析其效率，指出这种用能方式没有充分合理地利用天然气，提出了热能梯级利用的参考建议。
Following an analysis of its exergy efficiency, it is pointed out that natural gas can not be rationally utilized by such a way of energy consumption.
哥哥从来没有上升到上面的一个梯级或者抬起脚来攀登一下。
The elder brother never gained a stave, or raised his foot to mount one.
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