The paper makes introduction to structure and operation principle of roller mill, analyses the problems exists in vertical mill and roller press and developing trend of extruding mill.
介绍了辊筒磨的结构和工作原理，分析了立磨和辊压机存在的问题以及挤压磨机的发展趋势。
2
Roller coaster therapy might be a good preventive treatment for people who are high risk of developing obstructive kidney stones, wrote Wartinger and Mitchell.
过山车疗法对梗阻性肾结石易患人群可能是个很好的预防疗法，沃汀格尔和米切尔在报告中说。
3
On the basis of the need on developing guide roller of Baosteel plate slab continuous casting machine, the two belt electrode build-up welding machines were designed and manufactured.