2 sentences

1. 这部电影是该导演的巅峰力作。

   zhè bù diàn​yǐng shì gāi dǎo​yǎn de diān​fēng lì​zuò.

   This movie is the director's crowning masterpiece.

   Source: Dong Chinese Dictionary

2. 这部长篇小说是这位作家花费多年心血完成的力作。

   zhè bù cháng​piān xiǎo​shuō shì zhè wèi zuò​jiā huā​fèi duō nián xīn​xuè wán​chéng de lì​zuò.

   This novel is a masterpiece that the author spent many years of painstaking effort to complete.

   Source: Dong Chinese Dictionary