If we directly start the belt-driver which is driven by electric-roller, it can neither adjust speed according to the proportion of materials, nor prolong the life of electric-roller.

通过电动滚筒驱动的皮带机，如果直接起动，无法根据物料比重调节速度，无形中造成了电能的浪费，而且会缩短电动滚筒的使用寿命。

youdao

Jason then continued his journey on roller-blades until he was hit by a drunk driver, breaking both his legs and landing him in intensive care.

BBC: Jason Lewis: Circumnavigating the world