3 sentences

1. 这些信号必须被破译。

   zhè​xiē xìn​hào bì​xū bèi pò​yì.

   These signals must be deciphered.

   Source: OpenSubtitles

2. 这种军事密码很难被破译。

   zhè zhǒng jūn​shì mì​mǎ hěn nán bèi pò​yì.

   This military code is very difficult to decipher.

   Source: Dong Chinese Dictionary

3. 专家们成功地破译了敌方的加密电报。

   zhuān​jiā men chéng​gōng de pò​yì le dí​fāng de jiā​mì diàn​bào.

   Experts successfully decrypted the enemy's coded telegram.

   Source: Dong Chinese Dictionary