4 sentences

1. 这个家传秘方从不向外传。

   zhè gè jiā​chuán mì​fāng cóng bù xiàng wài​chuán.

   This secret family recipe is never shared with outsiders.

   Source: Dong Chinese Dictionary

2. 这是公司的内部消息，请勿外传。

   zhè shì gōng​sī de nèi​bù xiāo​xi, qǐng wù wài​chuán.

   This is internal company information; please do not share it externally.

   Source: Dong Chinese Dictionary

3. 他写了一本关于那位名将的外传。

   tā xiě le yī běn guān​yú nà wèi míng​jiàng de wài​zhuàn.

   He wrote an unofficial biography about that famous general.

   Source: Dong Chinese Dictionary

4. 坊间外传他即将辞去总裁的职务。

   fāng​jiān wài​chuán tā jí​jiāng cí​qù zǒng​cái de zhí​wù.

   It is rumored that he is about to resign from the position of president.

   Source: Dong Chinese Dictionary