对换

对换	duì huàn	to exchange / to swap
对	duì	right; correct / towards; at; for / concerning; regarding / to treat (sb a certain way) / to face / (bound form) opposite; facing; matching / to match together; to adjust / to fit; to suit / to answer; to reply / to add; to pour in (a fluid) / to check; to compare / classifier: couple; pair
换	huàn	to exchange / to change (clothes etc) / to substitute / to switch / to convert (currency)