2 sentences for 外传 (wài​chuán — divulge)

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