操作系统特性，如键盘响应、高对比度、鼠标键、声音卫士（SoundSentry），和声音显示（ShowSound）。
Operating system features, such as keyboard response, high contrast, mouse keys, SoundSentry, and ShowSounds.
继续长按这三个键，直到显示“下载模式”。这将会重装操作系统。
Keep holding until it says "download mode". This will reinstall the OS.
继续长按这三个键，直到显示“下载模式”。这将会重装操作系统。
Keep holding until it says "download mode". This will reinstall the OS.
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