最终的书达十二卷之多，几乎与一整套旧式百科全书等量齐观。

The final books add up to twelve volumes, or about the size of an entire old-style encyclopedia.

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这位大作家写了一部十二卷的叙事诗。

The author wrote an epic in twelve books.

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此外，他为欧几里得系统论述几何的十二卷专著写了精彩的概要。

In addition, he wrote a brilliant synopsis of Euclid's twelve-volume systematic treatment of geometry.

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