求翻译：Age of Empires is a household name. It wasn't the first RTS to grace the gaming globe, but it wasn't far behind the pack, and it was the first to show us that military combat was only one piece of the puzzle. Economics, politics, commerce and the ability to advance to a new age allowing access to previously unattainable technology; these are trademarks of the Age of Empires legacy, a legacy that began in 1997, and has since spawned more than a dozen sequels and spin-off titles selling hundreds of millions of copies around the world. It was really only a matter of time before you could play it for free.是什么意思？

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