Argument71 同主题写作第二期

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71Copper occurs in nature mixed with other minerals and valuable metals in ore, and the proportion of copper in the ore can vary considerably. Until fairly recently, the only way to extract pure copper from ore was by using a process that requires large amounts of electric energy, especially if the proportion of copper in the ore is low. New copper-extracting technologies can use up to 40 percent less electricity than the older method to process the same amount of raw ore, especially when the proportion of copper in the ore is high. Therefore, we can expect the amount of electricity used by the copper-extraction industry to decline significantly.

提纲：
1,新技术不一定省电的：新的技术在处理相同数量的矿石时用电量可以减少40%，但是如果原材料的含铜量不一样的话，就算可以省40%的电产出的铜也不一定就多的，而且文中指出在铜的含量比较高的时候尤其如此，但是可能在含铜量比较低的时候就比较多了。最好要求同等数量的铜矿的含铜量相同，然后比较两者用电量才可以的，但是这往往是在提取之后才知道的。
2,如果铜矿提取工业的耗电量要减少的话,那么新技术要大规模的应用,但是可能系新技术还不是很成熟,或者其他方面的要求比较苛刻,或者费用比较高,都是可能的.铜矿提取工业是不是还有其他工序需要大量的电能,如果这样的话,新技术的推广也不能显著减少耗电量.而且可能对于一些含铜量比较低的矿来说，采用这种方法并不是很合算的。而且可能随着用电量的减少，铜的产量可能大幅上升，那么用电量到底是增加还是减少就不知道了。

正文：
The author enthusiastically advocated the application of the new copper-extracting technology which can significantly decrease the amount of electricity energy used comparing with the original method, and he predicated the declined amount of electricity used in copper-extraction industry. This argument is well-present, but not thoroughly well-reasoned, after close examination.

Based on the comparison of amount of electricity used between the old method and the new one, however, we simply can not reach the conclusion of the efficiency of the new. Firstly, there is no detailed information about how the statistics of 40% come into being. Whether the processing object of the same amount of ore, as indicated in the argument, is of the same proportion of copper? If the proportion is different, for example the ore processed by the old method is of relatively low proportion, which obviously would necessitate more electricity, while the ore treated by the new measure is of high proportion where the process of extracting is comparatively easy. In this instance, though, whether the new approach is superior to the old one should be put under suspension.

Even if the new method could save as much as 40% electric energy when the proportion of copper is high, nonetheless, this conclusion can not be extended to ore whose copper proportion is low. Perhaps the new approach would waste even more electricity when treating ore with low copper proportion, and this amount used is so excessive that the electricity saved when treating high proportional ore is counteracted by the electricity extravagated by treating ore of low copper proportion when processing high and low proportional ores at the same time. And the desirable method of comparing, nonetheless, is using the same amount of ore of the same proportion of copper, which can hardly be known until after processing.

Deeper down, even if the new method is electricity-economical, and whether the amount of electricity used in processing copper-comprised ore would decline significantly is not clear. For the total amount of electricity to decline, this new method should be widely applied, while there is nothing in the text to support its readily applicability, which involves many a issues to consider.  Whether this new method is safe enough to put into manufacturing, and in light of its up-emerging nature, safety can be hardly guaranteed. Whether the equipment of this new approach is too prohibitive to purchase? And if the new method can not rival with the old one when processing ore of low proportion, whether the factory whose main product is not copper with copper as a by-product should use the new approach which necessitates the purchase of equipment and potential more electricity? Perhaps not. Even if this new method can be readily utilized with lesser electricity and cheaper operation, and consequently reduces the overall cost of copper production, the total amount of copper produced would significantly increase which necessitates perhaps even more electricity, thus the prediction of declined electricity use can not stand as logical.

In sum, whether the new method necessitates less electricity should be examined through accurate comparative experiment between the two, and whether the application of the new approach would remarkably reduce the amount of electricity used in copper extracting process should depended on the feasibility of the new method, which, though, is not vindicated in the passage.