1. 摩擦球,钢种：friction axis ==> 摩擦轴 | friction ball ==> 摩擦球,钢种 | friction band brake ==> 摩擦闸箍
2. 钢种：钢质运输带 steel conveyor belt | 钢种 steel grade; type of steel; ball lump; friction ball; steel ball | 钢珠除灰器 shot cleaner