Ball screws for ram adjustment and crossrail adjustment.

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。