Automatic installation of dual-rail system, it gives the installation, maintenance has brought great convenience, but this may not have access to the sump.
双导轨自动安装系统，它给安装、维修带来了极大的方便，人可不必为此而进出污水坑。
2
The bus Train, a dual-mode vehicle that has the versatility of a bus, the speed of light rail and fuel economy vastly better than either.
公交火车，一种双重模式的机动车，即拥有公交车的功能，也具有轻轨的速度，甚至是比两者都还节省燃油。
3
There are 2 raildual beam bridge, for pad beam pad on each node truss should get off track, on the edge of the I-beam to pad.