That truck trailer combination you see on the highways not a semi. The trailer that hooks onto the tractor is not a complete trailer (has no front wheels) it is called a semi-trailer, the part of the truck that supplies the power to the trailer is called a tractor. Actually, any vehicle designed to pull something fits into the 'tractor' category (in prop airplanes, propellers in front of the fuselage is a tractor confituration).
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DeanMSands3 commented: It all makes sense now! +0
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scru commented: Do you understand what Statistically means? +0
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GrimJack commented: Wow, yes! - it went right over my head, heh,heh +5
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Dave Sinkula commented: But I felt my wording was a little more subtle. +13
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