live-roller conveyer roller train 滚轴运输机
roller r train 滚轴式输送机
roller bearings for goods train 铁路货车滚子轴承
At its most basic level, a roller coaster is a machine that USES gravity to send a train along a winding track.
从最基本的层面来说，过山车是一种利用重力让车体沿着弯曲轨道运行的机器。
Roller coasters have three basic parts – thetrack, the train, and a motor.
过山车有三个基本部分——轨道、车体和动力设备。
Located at Six Flags Discovery Kingdom in California, this roller coaster gives riders a sudden scare by stopping the train in mid-air.
加州六旗主题公园的垂直过山车，能在半空中突然停住，要多惊险有多惊险！
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