请翻译:A bill of exchange is an unconditional order in writing, addressed by one person to another, signed by the person giving it, requiring the person to whom it is addressed to pay on demand or at a fixed or deter-minable future time a sum certain in money to or to the order of a specified person, or to bearer. 译文: ( 1 )是由( 2 )签发的要求( 3 )向指定人或根据其指令向来人( 4 )一定金额的( 5 )。