大家帮看看，这句是什么意思？谢谢

auxiliary hydraulic user may include a clutch or coupling means of transmission for selectively connecting the engine to the load.

auxiliary hydraulic user may include a clutch or coupling means of transmission for selectively connecting the engine to the load.
辅助液压用户（？）可包括用于将发动机选择性地连接到负载的离合器或传动耦合装置
汽车里面的，不是特别熟悉，以前只做过两三个这方面的case，不知道对不对