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单击此处编辑母版标题样,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,Part B,Part E,Part D,Part A,Part C,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,Part B,Part E,Part D,Part A,Part C,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,Part B,Part E,Part D,Part A,Part C,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,Part B,Part E,Part D,Part A,Part C,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,Part B,Part E,Part D,Part A,Part C,单击此处编辑母版标题样,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 4 Metro Track,地铁轨道,Unit Aim,You will be able to,Advised Hours:,2 class hours,Try to list the components of tracks:,Operational steel rail,Fastenners,Sleepers,Ballast,Different parameters of tracks and gauge.,It must be very accurate for tracks and gauage.,Different subway design requires different size of train.,1435mm,The picture shows different gauge of different lines. It is quite accurate. Otherwise, it will be very dangerous.,facility,fsiliti,n.,设备,insert,ins:t,v.,插入,smoothly,smu:li,adv.,平稳地,information,nfmei,n,n.,信息,sign,sain,n.,标识,indicate,indikeit,v.,显示,escalator,esk,le,t,n.,扶梯,available,veilbl,adj.,可利用的,distance-based,基于距离的,click,klik,v.,点击,handicapped,hndi:,kpt,adj.,残疾的,elevator,eliveit,n.,电梯,
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