如果对于给定的合作伙伴没有电子邮件地址，就返回一个空的String。

If there is no email address for a given partner, an empty String is returned.

youdao

没有找到邮件地址。

Can't find email address.

youdao

没有XX的电子邮件地址。

There is no email address for XX.

youdao

“，”此电子邮件地址没有被我们的记录。“

This email address was not found in our records.

youdao

“，”此电子邮件地址没有被我们的记录。“

This email address was not found in our records.

youdao