Dont quote me on this, but i looked it up a few months ago and from what I remember its two things:
1) In case you are travelling by land (basically in euroafroasia), the change in language a gradient. So you basically make people from the region between the two places youre travelling between either teach your men the language or act as interpreters themselves
2) A lot of pointing and gestures and people on both sides learning each others languages to act as interpreters
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