求翻译：10．Here again, the promises were vague. Google said the goal is to make sure that Android devices are compatible with new versions of the software for 18 months after release but didn't say whether they'll get those updates in a timely fashion. Still, the very fact that the company acknowledged the desirability of reducing Android's complexity was encouraging. Until now, it's tended to reject the idea that fragmentation of the operating system existed at all 是什么意思？

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