This money must be saved for the purpose of hedging against change in the exchange rate.
 

为防备汇率的变化，这笔钱必须存起来。
 

2.incumbent 在职者；现任者
 

George Bush, the incumbent, wants Congress to let oil firms drill in areas of Alaska and coastal waters that are currently off-limits for environmental reasons.
 

现任总统布什希望国会允许石油企业在阿拉斯加地区以及沿海水域钻油，这些地区目前由于环境原因禁止开采。