roller

• They pushed the boat down to the water on rollers
  他们将船放在滚木上推滚下水去。
• Welded steel pipe for supporting roller of belt conveyer
  带式输送机托辊用电焊钢管
• Estimating the distance between rollers of belt conveyor
  带式输送机托辊间距的确定
• A road roller is used in making and repairing roads
  压路机是用来修筑道路的。
• Rolling bearings ; spherical roller bearings , double row
  滚动轴承.双列球面滚柱轴承
• Too wide a setting between apron and front roller
  皮圈和前罗拉间的隔距太宽。
• Ships ' steel cargo blocks with roller bearings
  船上吊货用带滚柱轴承的钢制滑轮
• What are you buying when you get on a roller coaster
  坐上云霄飞车后你还想要什么
• Why were you humping at the roller skating ring
  你居然在旱冰场和她搞那种事？
• Bottom fluted rollers for drafting systems . dimensions
  牵伸装置下沟槽罗拉尺寸