By the time the Chinese silk trade became important in the world, the Silk Road covered almost 6500 kilometers.

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。

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By the time the Chinese silk trade became important in the world, the Silk Road had covered almost 6,500 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。

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He is in the silk trade.

他做丝绸生意。

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Premier Wen stressed China's role as "trusted brothers" of the Arab people and noted the history of trade between the nations dates back to the Silk Road.

VOA: standard.2009.11.07

Pakistan and Russia are as enthused about the Silk Trade Route's revival as China itself.

BBC: News | oldBusiness | The future shines for China's Silk Road

Their purpose was twofold: Abbas hoped to gain allies for his struggles against the encroaching Ottoman Turks and also to build up Iran's silk trade.

ECONOMIST: Two shows depict wealth, power and patronage

Carrying amorphous sacks, they passed back and forth over the heights of the Karakoram, along routes known to generations of Silk Road travellers, to trade in the remote oasis towns of Xinjiang.

BBC: Following the Silk Road to the end of China