我们加入了RAC，这样在路上遇到问题时可以获得帮助。

We joined the ___RAC so we can get help if we have car trouble on the road.

这个系统使用RAC技术来管理无线网络中的设备接入。

This system uses ___RAC technology to manage device access in wireless networks.

南非队赢得了今年的RAC锦标赛冠军。

South Africa won this year's ___RAC championship.