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比如说，德国人的坐标经常是基于1: 50, 000的法国地图，
This series had been withdrawn from use in the British Army.
Unable to obtain a copy of it, GC and CS was obliged to reconstruct it from the Germanreferences to it.
The Hut 3 filing systems, therefore, had to mirror the German system as a whole, in order togive meaning to the cipher traffic as a whole.
Only when this had been done could the Enigma decrypts yield their real value—not so much injuicy secret messages, but in giving a general knowledge of the enemy mind.
Without them, Europe was an almost complete blank, out of which anything could emerge.
With them, they had some insight into what was possible.