支座轮式半拖车
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trailer fifth wheel 拖车接轮
90 semi-trailer fifth wheel kingpin 半挂车牵引座的90号连接销
fifth wheel trailer
第五轮拖车
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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