很久以前，交通不便。就是有这么一些人，他们不愿意收到交通，地理的限制，一马当先，游历四海，成为著名的旅行家。张骞就是这样的一个人。他走过的路，今人叫做：丝绸之路。
Long ago when transportation wasn’t advanced, a group of people defied the limitations of transportation and geography. They set out for far, and travelled the oceans. They were great travelers. Zhang Qian is one of them. The road that he took is what we call “the Silk Road” today.