【参考译文】
The Silk Road is a historically important① international trade route, which was originated② during the 1st century BC. Because silk comprised a large proportion of③ trade along this road, in 1877, it was named "the Silk Road" by Ferdinand yon Richthofen, an eminent German geographer. It is not only an ancient international trade route, but also a splendid cultural bridge linking China, India, Persia, Greece and Rome, etc. It was through this bridge that④ the Four Great Inventions of China and religions of the West were introduced into each country.
【译点精析】
1．具有重要历史意义的：译为historically important。
2．起源于：译为originated。也可翻译为dated back t0、dated from等。3．占有很大比重：译为comprised a large proportion of.
4．正是通过这一桥梁：译为It was through this bridge that…。原文中的“正是”有强调的意味，故应采用强调句式。