expedient

有利的，可取的

【例】As things now stand, would you think it expedient for us to allow a special discount of 5% to that customer?

既已如此，你是否认为我们对那家客户给以5%的特别折扣为可取呢?

expedite    

加速

【例】Please do your utmost to expedite the establishment of the L/C.

请竭尽全力加速开出信用证。

expedition 

迅速，敏捷

【例】The Contractor should execute the Works with diligence and expedient.

承包商应勤奋而迅速地建造此工程。