求翻译：由于现有风力发电安装采用履带式起重机运输安装成本昂贵，三一电气与三一起重机合作开发风力发电机组专用汽车起重机，此产品专门针对风力发电机组建设维修特点开发,可吊将30吨部件提升到90米高度，牵引半挂式汽车底盘转场运输方便，填补了我国一项空白并申请了专利。是什么意思？

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Because of the failure of the existing wind power installation using crawler cranes transport and install high-cost, 31 electric and 31 cranes cooperation development of wind power generating units dedicated truck crane, the products specifically for wind power generation units, building maintenance

Because the existing wind power generation installment uses the crawler crane transportation to install the cost to be expensive, 31 electricities with 31 hoist crane cooperation development wind power generation unit special-purpose autohoist, this product aim at the wind power generation unit to c

Due to existing installed wind power installation of crawler cranes, transport costs high, 31 electric cooperative developing wind turbine dedicated 31 crane truck crane, this product features development specifically for construction of wind turbine generator maintenance, crane 30 ton parts up to 9