到中国的丝绸贸易在世界上变得重要的时候，丝绸之路已经长达6500公里。
By the time the Chinese silk trade became important in the world, the Silk Road covered almost 6500 kilometers.
到了中国的丝绸贸易成为世界重要贸易时，丝绸之路已经覆盖了将近6500公里。
By the time the Chinese silk trade became important in the world, the Silk Road had covered almost 6,500 kilometers.
张骞的西行促进了中国和西方之间的国际贸易，尤其是丝绸贸易的发展。
Zhang's journey to the West helped develop international trade, especially in silk, between China and the West.
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