分类：教育/科学-外语学习
问题：一段话翻译Beforethechange,itwasimposs 
Before the change,  was impossible to pause or even slow in the tunnel, and the wall was at best a blur. But the advent of one-way traffic means that a trip through the tunnel is no longer like being flung by a giant slingshot. Walking through is prohibited, but it is now possBefore the change,  was impossible to pause or even slow in the tunnel, and the wall was at best a blur. But the advent of one-way traffic means that a trip through the tunnel is no longer like being flung by a giant slingshot. Walking through is prohibited, but it is now possible to drive slowly up the tunnel pulled over to the right, while traffic moves past on the left at normal speed. 
回答：在改变（指的是由双行线改为向北的单行线）之前，在隧道里中途停止甚或慢速行驶都是不可能的，隧道的墙壁因为驾车疾驶而成为模糊的一片。单行线的出现意味着在隧道里驱车游览不必再像离弦的箭一样快速通过。虽然步行是被禁止的，但是你可以把车开到右边慢速行驶，而其它的车辆则可以以正常的速度从左边经过。