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摄影和图形复制设备。
iOS模拟器可能在复制设备体验方面做得最好，但是你需要在每个设备上都进行测试，以确保你用到的所有东西都有合理的性能。
The iOS simulator probably does the best job of duplicating the device experience, but you need to test on each device to make sure that everything you're using has reasonable performance.
这是一个复杂的系统，数据被复制到多个中间设备，通常是为了在数百万人同时试图访问服务时加快文件访问速度。
It's a complex system wherein data is copied to multiple intermediate devices, usually to speed up access to files when millions of people are trying to access the service at the same time.
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