WTO的规定留给这些国家相当大的余地，经过20年的单边削减关税，大多数国家的关税水平都低于约定税率（bond rates），即贸易谈判达成协议的关税上限。

The WTO’s rules allow them plenty of scope: after two decades of unilateral tariff-cutting most of their tariffs are well below their “bound” rates, the ceilings agreed in the trade club.

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