Charles Bradley提出了类似的建议，不过他指出还要获得一个有条件的承诺。
Charles Bradley made a similar suggestion with a conditional promise in advance. He suggested.
信用证(L/C---lettle of credit)是一种有条件的银行付款承诺，承担第一付款责任，是一种银行信用，代替买卖双方负责付款和提交单据，对进出口双方（特别是彼此不熟悉的客户）的利益较有保障。
In L/C transaction, the banker is responsible to pay money and tender documents on behalf of both parties.
大卫·卡梅伦的联合内阁也重申了这一承诺，将在年底之前会有条件的兑现，以使其成为“一个成功的商业案例”。
David Cameron's coalition cabinet has reaffirmed this pledge, conditional on being presented with "a satisfactory business case" before the end of the year.
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