His latest offering is a magnum opus on philosophy.

他的最新作品是一部关于哲学的巨著。

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It is a magnum opus painting that takes ox as the theme in Chinese art history.

五牛图卷是中国美术史上以牛为题材的绘画代表作品。

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A magnum opus is the greatest or most important work produced by a writer, artist, musician, or academic.

作家，艺术家，音乐家亦或学术界学者，一部大部头的作品也许是他最伟大或者最重要的成果。(和后面的冗长好像有些吻合)。

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That project, which Hanks' website describes as "part thriller, part real-time drama, " is based on a small portion of Bugliosi's magnum opus.

NPR: 50 Years On, Finding Profit In 'Truth' On JFK Case

Pundits including Rush Limbaugh and Rick Santelli urge listeners to read her books, and her magnum opus, "Atlas Shrugged, " is selling at a faster rate today than at any time during its 51-year history.

WSJ: Is Rand Relevant?

As a trained historian, and meticulous independent scholar, David was equally bold and original His recently published magnum opus, L'Exil Au Maghreb.

CENTERFORSECURITYPOLICY: Center For Security Policy