參考答案:

The Silk Road is one of the greatest and most important trade routes. It is the overland route that connects China and Europe, the East and the West. The Silk Road began in the 2nd century BCE when Han Emperor gave Zhang Qian the diplomatic missions of visiting the Western regions. The Silk Road was largely scattered and very few merchants ever crossed the whole route. Most of the areas along the road were rugged or with hostile forces, which made the route quite dangerous. Therefore, the supply of silk and other goods was often limited.

來源:可可英語 http://www.ccdyzl.cn/menu/201406/302923.shtml