滑枕和横梁为滚珠丝杠。
Meanwhile crossrail is essential in order to cope with London's growing population.同时,横木对应付伦敦不断增长的人口起着重要作用。
After decades of wrangling, there is agreement at last on a fast underground crossrail linking suburbs west and east, but this will not be open until 2017 at the earliest and the cost has spiralled.经过数十年的争论,终于达成协议,建设一条连接东西郊的快速地铁(伦敦横贯铁路,Crossrail),但是项目动工时间不会早于2017年,而且工程成本也在不断增加。