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to exchange; to swap; to convert (currency, units); to switch over
to exchange; to interchange; to renew
to substitute (person, staff member, player, etc.)
車の古いタイヤを新品のタイヤに換えた。
I replaced the car's old tires with new ones.
旅行前に銀行で円をドルに換えておきたい。
I want to exchange yen for dollars at the bank.
時計が止まったので電池を換える時期が来た。
It's time to replace the batteries.