你兑换外币了吗？

Have you exchanged foreign currency?

你可以在银行兑换外币。

You can convert foreign currency at the bank.

请填写这张外币申报单。

Please fill out this foreign currency declaration form.

银行可以兑换多种外币。

The bank can exchange various types of foreign currency.

外币的贴水比预期的要高。

The agio on the foreign currency was higher than expected.