这台分析机是现代数字计算机的前身，但从未完成过。
The forerunner of the modern digital computer, the Analytical Engine was never completed.
克隆人营房的设计可以回溯到为《星球大战：第二部——克隆人的进攻》打造出来的概念，2000年时的概念设计小组对这些概念进行了探索，但从未完成设计。
The designs for the clone barracks dates back to concepts developed for Star Wars: Episode II Attack of the Clones, which were explored by the concept design team back in 2000, but never finished.
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