Anticipating that in many cases even the mfn rates were prohibitively high , the uraa required member countries to guarantee a prespecified minimum ( de minimis ) market access for each product 因为预见到在很多情况下即使最惠国税率也依然达到了禁止性关税的高位,因此乌拉圭回合农业协议要求各成员国保障每种产品的最低市场准入。