drum roll step 擂鼓步
step roll 回转式卷法
Step & Roll 平衡滚球
multi step continuous roll forging 多道连续辊锻
·2,447,543篇论文数据，部分数据来源于NoteExpress
Multi-million pound plans to roll out superfast broadband across Northamptonshire have moved a step closer after the county council appointed BT as its preferred supplier.
BBC: Superfast broadband plan for Northamptonshire
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