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fifth wheel /ˈfɪfθ ˈwiːl/ n

中文：牵引座

中文 · 牵引座Español · disco de articulaciónFrançais · sellette d’attelage
Meaning：Coupling device enabling the tractor to be connected to the semitrailer and supporting its front portion.
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Found in these illustrated scenes（1）

Truck tractor

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