A fixed price guarantees a broken promise.

固定的价格就是保证要背叛承诺。

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These walls are extremely costly, but that price guarantees security against all but the most well-prepared besieging force.

巨墙造价极为昂贵，但高昂成本保证了它可傲然面对任何强敌。

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Indeed, while buying at the right price may ultimately determine the profit gained, selling at the right price guarantees the actual profit, if any.

尽管在正确的价位买入股票的确会最终决定赚得的利润，但是，如果有获利的话，在正确的价位卖出股票可以确保获得实际利润。

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NAFTA, price guarantees have disappeared, and the border has opened to imports from the United States, which are often cheaper.

ECONOMIST: The problems of plugging a square economy into a round world

You should check for price guarantees over the term of your contract.

CNN: Watch out for too-good-to-be-true free PCs

Another weapon many travel providers are likely to deploy are lowest-price guarantees.

ECONOMIST: The travel industry