地球上的一块矿物和一张犁、一把斧、一把锯之间相似之处很少；

There is little resemblance between a piece of a mineral substance found in the earth, and a plough, an axe, or a saw.

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但是同一套工具也许足以供制犁匠锻制上百张犁，而且这些犁可在其12年使用期内为很多不同的农场翻土。

But the same set of tools, perhaps, suffice to the plough-maker for forging a hundred ploughs, which serve during the twelve years of their existence to prepare the soil of as many different farms.

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