For ten years she dwelled among the nomads of North America.她在北美游牧民中生活了十年。...a country of nomads who raise cattle and camels.饲养牛和骆驼的游牧国度The townsmen despise and cheat the nomads.城镇居民轻视和诈骗游牧民.Nomads have inhabited this re...
The workpiece is already on the lathe.工件已经上了车床.We used grinding machines only to smooth and finish a workpiece.我们只是用磨床将工件抛光和精加工.The carriage feeds the tool while the workpiece rotates.当工件旋转时,拖板送进刀具....