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A message for Christopher and hopefully moderators: I would like to grade this question giving 4 points to Christopher, but the system declines this answer instead of attributing points to it. I am really sorry, Christopher, but I guess there is a technical problem here.
Still can't add to my answer for some reason, so I'll put it here:
If the "voies" here are to be interpreted literally, the "deux voies de diffusion" are surely not "roads", at this period, but more generalised "routes" (as in "migration routes")
I tried to add something to my answer but the software is apparently malfunctioning, so I'll try and add it here:
The "neolithic revolution" is a commonly used English term to refer not just to the newer technology of working stone tools but also of
16:37 Feb 23, 2006
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6 mins confidence: peer agreement (net): +4
the "neolithic revolution"
Explanation: penetrated into West-central France by two routes....
It sounds like actual, literal *geographic* routes are intended, but perhaps something else is involved, since "voies de diffusion" can be taken metaphorically.
Hard to tell without the subsequent context which will specify these "voies".