Duties and taxes are the most obvious barrier to free trade.

关税及其他各种税是自由贸易最明显的障碍。

《柯林斯英汉双解大词典》

If not, a trade barrier has been raised.

如果不这样做的话，现有的贸易壁垒就无法减少。

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Dutiess and taxes are the most obvious barrier to free trade.

关税及其他各种税是自由贸易最明显的障碍。

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Second, even if the offset argument is valid with the VEETC in place, the tariff still represents a substantial barrier to trade.

FORBES: Implications Of The U.S. Ethanol Tariff

This ambiguity also frustrates American trade officials, who consider European labelling laws, both in theory and in their rather confused practice, to be a technical barrier to trade.

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The simplicity of the American plan is attractive but also potentially misleading: as most poor countries know to their cost, tariffs are not the only barrier to trade.

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