图书 · An Inquiry into the Wealth of Nations
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作者: Adam Smith
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343, 344.} The annual grasses were, it seems, the best natural
grasses in that part of North America; and when the Europeans
first settled there, they used to grow very thick, and to rise
three or four feet high. A piece of ground which, when he wrote,
could not maintain one cow, would in former times, he was
assured, have maintained four, each of which would have given
four times the quantity of milk which that one was capable of
giving. The poorness of the pasture had, in his opinion,
occasioned the degradation of their cattle, which degenerated
sensibly from one generation to another. They were probably not
unlike that stunted breed which was common all over Scotland
thirty or forty years ago, and which is now so much mended
through the greater part of the low country, not so much by a
change of the breed, though that expedient has been employed in
some places, as by a more plentiful method of feeding them.
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