求翻译：公元前250年左右被托勒密二世重新获得。在随后的一千年中被连续改进、摧毁和重建，直到最终于公元8世纪为阿拉伯帝国阿拔斯王朝的哈里发曼苏尔（al-Mansur）废弃。是什么意思？

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Around 250 BCE, the Ptolemy's re-2. In the ensuing 1000 is in continuous improvement, destroyed and rebuilt, until finally in the year for 8th century, the Arab Empire dynasty of the Caliph Mansour (al-Mansur) waste.

About 250 B.C. are held to force dense two th to obtain.Is improved continuously in afterwards 1000 years, the destroy and the reconstruction, until finally Arab League pulls out Si dynasty Harry in the A.D. 8 centuries for the Arabic empire to send graceful Soviet you (al-Mansur) to abandon.

Around 250 BC, was regained by tuolemiershi. Is continuous improvement in the next 1000 years, destroyed and rebuilt, until the final in 8th century Arab imperial dynasty Caliph Abbas Mansour (al-Mansur) abandoned.

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