The core of Europe's single market-a ban on tariffs, quotas, and subsidies, protected by the Schengen Agreement prohibiting border controls and competition policy-seems to be holding firm.

欧洲单一市场的核心——关税，配额和补贴的禁令，受禁止边界控制和竞争政策的申根条约保护——看上去得到了坚决执行。

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In 2009 Mexico imposed tariffs on $2.3 billion of American goods, after the United States stopped letting Mexican lorries past the border area.

2009年，在美国禁止墨西哥货车越过边境后，墨西哥对美国货物收取了价值23亿美元的关税。

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Yet, even ignoring the tariffs and other restrictions still in place, cross-border trade remains tiny as compared with the volume of goods and service traded within countries;

然而，即使忽略关税和其他已存在的限制，跨境的境内的商品和服务数量比较起来显得还是微不足的。

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Yet, even ignoring the tariffs and other restrictions still in place, cross-border trade remains tiny as compared with the volume of goods and service traded within countries;

然而，即使忽略关税和其他已存在的限制，跨境的境内的商品和服务数量比较起来显得还是微不足的。

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