... engine cover width发动机罩宽度 fifth wheel coupling pin牵引座牵引销 fifth wheel lead牵引座前置距 ...
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fifth wheel coupling pin
第五轮联轴器销
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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