3 sentences

1. 我不承认这个法庭的合法性。

   wǒ bù chéng​rèn zhè gè fǎ​tíng de hé​fǎ​xìng.

   I do not recognize the legitimacy of this court.

   Source: OpenSubtitles

2. 政府的权力源于法律授予的合法性。

   zhèng​fǔ de quán​lì yuán​yú fǎ​lǜ shòu​yǔ de hé​fǎ​xìng.

   The government's power stems from the legitimacy granted by law.

   Source: Dong Chinese Dictionary

3. 法律专家对这一程序的合法性提出了质问。

   fǎ​lǜ zhuān​jiā duì zhè yī chéng​xù de hé​fǎ​xìng tí​chū le zhì​wèn.

   Legal experts questioned the legality of this procedure.

   Source: Dong Chinese Dictionary