单词	發必中的
释义	同ARROW
随便看	roller guide roller hardening roller-head machine roller hearth furnace roller hockey roller kneading machine roller launching roller leather roller length roller leveler roller leveling roller levelling roller lift bascule bridge roller-lift bascule bridge roller locker machine roller lubrication roller milk roll(er) mill roller mill roller mill method roller mill press roller motion bearing roller nest roller nip roller nip feed