3 sentences

1. 你可以去银行兑换外币。

   nǐ kě​yǐ qù yín​háng duì​huàn wài​bì.

   You can go to the bank to exchange foreign currency.

   Source: Dong Chinese Dictionary

2. 我们不收外币。

   wǒ​men bù shōu wài​bì.

   We don't take foreign currency.

   Source: OpenSubtitles

3. 去那个摊位兑换外币要收两分水。

   qù nà gè tān​wèi duì​huàn wài​bì yào shōu liǎng fēn shuǐ.

   Changing foreign currency at that stall costs a two percent commission.

   Source: Dong Chinese Dictionary