The former is described in the trade negotiators’ lexicon as the “most favored nation” principle, which essentially seeks to ensure that trade benefits provided to one country are provided to all. The latter requires member states to provide the same treatment to trading partners within national borders as that provided to nationals.
多边体系基于两个原则：无歧视和国民待遇。前者在贸易谈判者的词典中就是“最惠国”原则，即保证向一国提供的贸易优惠条件同时向所有国家提供。后者要求成员国在国内向贸易伙伴国提供与本国国民一样的待遇。