4 sentences

1. 这部小说是他的杰作。

   zhè bù xiǎo​shuō shì tā de jié​zuò.

   This novel is his masterpiece.

   Source: Dong Chinese Dictionary

2. 这部作品堪称杰作。

   zhè bù zuò​pǐn kān​chēng jié​zuò.

   This work can be called a masterpiece.

   Source: Dong Chinese Dictionary

3. 这是我们的杰作。

   zhè shì wǒ​men de jié​zuò.

   This is our masterpiece.

   Source: OpenSubtitles

4. 故宫是中国古代建筑的杰作。

   Gù​gōng shì Zhōng​guó gǔ​dài jiàn​zhù de jié​zuò.

   The Forbidden City is a masterpiece of ancient Chinese architecture.

   Source: Dong Chinese Dictionary