知识贝壳
知识贝壳
所属栏目：建筑施工英语
Therailroadsofthenearfuturewillprobablynotinvolveanyspectacularlynewprinciplebutwillbedevelopmentsofthoseweusetoday.Therailadministrationshavebuilttheirentiresystemtoastereotypedmodel,withtwosteelrailsofaparticulartypeseparatedbya“gauge”ofabout1.43m,1.07m ......（本文共 5689 字 ） [阅读本文] >>