以色列可以伺机破坏有关安排，例如，它可以不履行先前的承诺，继续拒绝将关税收入交予巴勒斯坦。
Israel could seek to kibosh the arrangement, for instance by continuing to refuse to let the Palestinians receive customs revenue that it previously agreed to pass on.
正如遭受赤字打击的国家所经历的那样，自我筹集资金的效果是很难预测的，减少的贸易壁垒已经使得关税收入降低，而对金融交易征税则可能会受制于下一次的经济衰退或银行危机。
Customs duties have fallen as trade barriers have been reduced. A tax on financial transactions would be hostage to the next recession or banking crisis.
欧洲预算的大部分支出都根据共同农业政策用于农产品补助，而大部分收入都来自关税和农业进口税收。
Most of the spending went on farm subsidies under the common agricultural policy (CAP); much of the revenue came from customs duties and farm-import levies.
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