2 sentences

1. 他正在研读《旧约》中的先知书。

   tā zhèng​zài yán​dú《 Jiù​yuē》 zhōng de xiān​zhī​shū.

   He is studying the prophetic books of the Old Testament.

   Source: Dong Chinese Dictionary

2. 既然新协议已经签署，旧约就此失效。

   jì​rán xīn xié​yì yǐ​jīng qiān​shǔ, jiù​yuē jiù​cǐ shī​xiào.

   Since the new agreement has been signed, the old treaty is now void.

   Source: Dong Chinese Dictionary