Compare this to rooted users, who can just install any of a number of apps that can take screenshots if you shake the phone, or after a timer counts down.
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如果你不愿意拿个厨房计时器,你可以用iPhone的秒表功能或者给你的智能手机下载一个秒表软件。
If you don't want to use a kitchen timer, use the stopwatch function on your iPhone or download a stopwatch application for your smartphone.