约束关税是作出减让的成员可以征收的关税的上限，关税与贸易总协定不禁止作出减让的国家实际适用比约束关税低的关税。
比如，欧盟的实际平均农业税是12％，平均约束关税为21％。
The EU's average actual farm tariff, for example, is 12%, while the average bound tariff is 21%.
提议中还是有不少显而易见的好处，那些削减约束关税的国家必然伤及实际税率。
Also on offer were benefits that are easier to visualise. Some cuts in bound tariffs would have bitten into actual rates.
截至目前，大多数国家尚未把关税提高到约束水平，也尚未充分利用农产品补贴的余量。
To date most countries have not yet raised tariffs to bound levels or taken full advantage of headroom on agricultural subsidies.
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