指双边或多边贸易协定中允许签约国在享受关税或其他贸易减让的进口商品过多，使国内产业受到进口竞争的损害时，可暂时取消减让待遇的条款。
在有些领域，如广播转播权，国会已将其列入反垄断法豁免条款，从而保护此类的协作。
In a number of areas, such as broadcasting rights, Congress has written exemptions to antitrust law to protect such collaboration.
当涉及到谈判时，很难不要求那些选择性的豁免条款，但他不应该为了获胜而做出那么多错误的决定。
When it comes to negotiation, it would be hard to retreat from asking for those opt-outs, but he should not make too much of a failure to win.
加拿大官员说，如果这个条款成为法律，他们希望能保证对加拿大产品做出豁免。
Canadian officials say they hope to secure a waiver for Canadian products if the provision becomes law.
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