一

The Qinghai-Tibet Railway is the highest and the longest plateau railway in the world ,with the total length(全長) of 1956 kilometers ，within which 960 km is above altitude of 4000 meters.(其中有960公里在海拔4000米以上)It is the first railway ，which linked Tibet to Chinese other places. (當中有動詞"連接"用定語從句)

二

我

Due to the railway thoughout the most fragile ecosystem in the world,it has been taken manners措施 of ecological protection to ensure it

瑞

As the railway crosses(穿越) the most fragile /vulnerable(脆弱的) ecosystem in the world.Ecological protection measures(生態(tài)保護措施) have been taken during and after the construction(在建成期間和建成后) to make sure(確保) that it becomes a "Green Railway"

三

The Qinghai-Tibet Railway has greatly shortened the traveling time from Chinese Mainland(內陸) to Tibet.(中國內地與西藏之間)

四

More importantly(更重要的是),it has greatly promoted/boosted the economical development in Tibet and has improved life quality of local residents /locals.(當?shù)鼐用?

五

After the opening (開通)of the railway， an increasing number of people go to(前往) Tibet by train(火車) ，so that (這樣)they also have chances to enjoy landscape along the way(沿途的) .