Ball screws for ram adjustment and crossrail adjustment.
滑枕和横梁为滚珠丝杠。
2
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。
3
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.