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.
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。
If the main device fails, the backup can take over, duplicating all the encryption parameters, that were in force.
如果主设备失灵，备用设备可切换过来，将所有有效的加密参数复制下来。
If the main device fails, the backup can take over, duplicating all the encryption parameters, that were in force.
如果主设备失灵，备用设备可切换过来，将所有有效的加密参数复制下来。
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