But when Rome collapsed in the fifth century and the Middle Ages began, direct trade of spices stopped, and so did that kind of hands-on knowledge of travel and geography.

但到了5世纪，罗马帝国崩塌了，中世纪开始了，香料直接贸易停止了，所以人们对于香料的运输和来源地的直接认识也就中断了。

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They could sail out for days into the unknown and assess the area, secure in the knowledge that if they didn't find anything, they could turn about and catch a swift ride back on the trade winds.

他们可以在未知的海域航行数天，并对该地区进行评估。他们知道如果没有发现任何东西的话，他们可以掉头，并借着信风迅速返回。

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Besides trade, knowledge about science, arts and literature, as well as crafts and technologies was shared across the Silk Road.

除了贸易，科学、艺术、文学、工艺和技术等也在丝绸之路上得到交流。

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They have set out to create a new set of standards in social search and global trade of knowledge.

FORBES: The Rise of the Knowledge Market

Moreover, trade disseminates knowledge and technology.

ECONOMIST: A short tour of economic theory

We noted progress in the Maximizing Agricultural Revenue through Knowledge, Enterprise Development and Trade (MARKET), a U.S. program that directly supports the ASEAN Integrated Food Security (AIFS) framework and associated Strategic Plan of Action for Food Security (SPA-FS), emphasizing enhanced trade facilitation as well as improved farmer and policy-maker access to information, in partnership with the private sector.

WHITEHOUSE: Joint Statement of the 4th ASEAN-U.S. Leaders' Meeting