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Spoken in 3 clips from 3 channels · B2–C1 · other forms: wheels
Then I'll add the wheels in there.
The danger with the muddy crossings versus the sandy crossings is that the wheels just get gummed up with mud.
We have people from all over the world, from third-world nations, nations that on their own would have never invented the wheel, let alone modern technology, let alone medicine, let alone air travel.