求翻译：我公司为此服务项目配备两到三位IT工程师，按照用户需求进行上门服务。两到三位工程师中，其中一位为主要服务工程师另外一到二位为备援服务人员。是什么意思？

Our project for this service with two or three IT engineers, according to user needs on-site service. Two or three engineers, one of the main service engineer another one to two for the redundant service.

My company for this purpose service project has been provided with two to three IT engineers, in accordance with user needs for on-site service. In two to three engineers, one of whom is a major service engineer in addition to the 2 bit back for service providers.

Our company provides for this service project two to three Engineer IT, carries on according to the user demand visits the service.Two to three engineers in, other for prepares for main service engineer one to two helps the service personnel.

Our company for this service item is equipped with two or three IT engineer, door-to-door service according to user requirements. In two or three agents, including one as the main service engineer in addition to the second place as a backup service.

Our company allocates two to three IT engineers for this service item, make house calls according to the user's needs. Two is in three engineers, one of these aids attendants in order to prepare against to two for another of engineer of main service.