换汇的英文：
swap

参考例句：

local currency cost of export earnings;Unit export cost
换汇成本

swap是什么意思：
n. 交换；交换物
v. 与…交换；与…交易；替换

I like to swap with you.
我愿意和你做交易。

The stock swap is expected to be completed in March.
预计换股交易将在明年3月完成。

They swapped notes on progress in their particular fields.
他们就各自领域的发展情况交换了意见。

Never swap (or swop) horses while crossing the stream.
骑渡中流莫换马。

The manager allows Bob to swap shifts with other employees
经理允许鲍勃与其它员工换班