On these cranes,the hydraulic rams that extend to raise up the crane do not push on the boom,but instead on a pivoting link-bar.是什么意思_On these cranes,the hydraulic rams that extend to raise up the crane do not push on the boom,but instead on a pivoting link-bar.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句