这是他关于古罗马的三部曲中的第一本书。

This is the first book in his ___trilogy about ancient Rome.

《终结者》三部曲以其描绘的反乌托邦未来而闻名。

The Terminator ___trilogy is famous for its depiction of a dystopian future.

她计划写一个探索三代人生活的三部曲。

She plans to write a ___trilogy exploring the lives of three generations.