They are employed by companies which own and operate heavy equipment, and by heavy equipment dealers, rental and service establishments, and railway transport companies and urban transit systems.
他们受雇于拥有及经营重型设备的公司，重型设备经销商，出租及服务机构，以及铁路运输企业和城市公交系统。
They are employed by companies which own and operate heavy equipment, and by heavy equipment dealers, rental and service establishments, and railway transport companies and urban transit systems.
他们受雇于拥有和经营重型装备的公司，重型装备经销商，租赁和服务机构，以及铁路运输企业和城市轨道交通系统。
As far as the complicate heavy equipment is concerned the process of research and development is a complicate and technology concentrated systems engineering.
对于大型复杂设备而言，其研制过程是一项复杂的、技术密集的系统工程。
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