人们用货币进行买卖交易。

Rénmen yòng huòbì jìnxíng mǎimài jiāoyì.

People use currency for buying and selling transactions.

银行是货币存储和交易的地方。

Yínháng shì huòbì cúnchǔ hé jiāoyì de dìfāng.

Banks are the places for currency storage and transactions.

学生在国外留学时需要了解当地的货币。

Xuéshēng zài guówài liúxué shí xūyào liǎojiě dāngdì de huòbì.

Students need to understand the local currency when studying abroad.