Arm post type of jib arm crane is a medium-sized lifting and transporting equipment.It has a unique structure, and is safe and dependable.是什么意思_Arm post type of jib arm crane is a medium-sized lifting and transporting equipment.It has a unique structure, and is safe and dependable.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句