In addition to visible trades such as import and export goods and merchandise etc. outside, there is also invisible trade, include the commutation for serving of the of nation among them.

除了进出口货物和商品等有形交易之外，还有无形交易，其中包含国家之间服务的交换。

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As the products contain numerous invisible values in the knowledge-based economic era, the parallel import has taken up an important position in intellectual property law.

对于平行进口的知识产权解释与研究如火如荼，但其他两层关系的重要性却被人们忽略和淡化了。

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