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telescopic boom /tˌɛlɪskˈɒpɪk ˈbuːm/ n

中文：伸缩臂

中文 · 伸缩臂Español · brazo telescópicoFrançais · flèche télescopique
Meaning：Extensible device that raises the sliding ladders of the tower ladder to the desired height.
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Truck crane

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