... interchange trailern.1. 交换追踪器 trailer fifth wheel拖车接轮 tractor and trailer牵引车和拖车 ...
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90 semi-trailer fifth wheel kingpin 半挂车牵引座的90号连接销
fifth wheel trailer 支座轮式半拖车
Trailers are typically attached to tractors by a "fifth wheel, " in which a coupling pin on the trailer fits into the center of a large horseshoe-shaped piece of metal.
NPR: Runaway Trailer Crashes Rare; NY Accident Killed 7
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