正在你出国之前，该当后寄给客户一些样品。

You must send some sample to the customer before you go abroad.

youdao

在你出国之前，应该先寄给客户一些样品。

You must send some sample to the customer before you go abroad.

youdao

在你出国之前，应该先寄给客户一些样品。

You must send some sample to the customer before you go abroad.

youdao