Be careful, make sure you know the sender before you open an email.

小心，在你开信箱前要先确定那些寄件人是谁。

youdao

Make sure you know the sender before you open an email.

在你开信前要先确定你知道那些寄件人是谁。

youdao

Make sure you know the sender before you open an email.

在你开信前要先确定你知道那些寄件人是谁。

youdao