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- Figure 7-13(a) shows a man standing on frictionless roller skates on a level surface, facing a rigid wall. 图7－13（a）表示一个人穿着无摩擦的有轮滑冰鞋站在水平平面上，面对着一堵坚硬的墙。
- frictionless roller 无摩擦滚轴
- The ride on the roller coaster dizzied us. 乘坐云霄飞车使我们头晕。
- May I borrow your roller skates? 我可以借你的旱冰鞋吗？
- Clattering along on roller skates. 踩着轮式溜冰鞋行进
- A road roller is used in making and repairing roads. 压路机是用来修筑道路的。
- If the wall is frictionless, ??is horizontal. 如果墙壁无摩擦，?痪臀0水平方向。
- A steel tube or wooden roller on which the warp is wound in a loom. 卷轴织机上的铁管或木轮，供经线缠绕之用
- There is a frictionless hinge at C. c点是无摩擦铰。
- Pulley bearings are frictionless. 滑轮轴承是无摩擦的。
- They used a steam roller to iron out the road. 他们用蒸汽压路机压平了路面。
- The road roller evens out the ground. 压路机把地面压平。
- You may apply it with brush or roller. 你可以使用毛刷或辊子进行涂抹。
- I want to ride on the roller coaster. 我想坐过山车。
- The roller coaster scared me out of my wits. 云霄飞车令我惊慌得穷于应付。
- Smooth, frictionless, with a powerful hindquarters' drive. 平顺，滑动，后躯驱动力强大。
- I want to ride on the roller coaster, too. 我还要坐摩天轮。
- A perpetual motion machine would have to be frictionless. 永动机只能是一种无摩擦力的机器。
- Everybody can roller skate in the park. 每个人都可以在这个公园内溜冰。
- Insufficient pressure in pressure roller. 加压罗拉压力不足。
