| 摘要 |
A processing device may include a display screen and one or more buttons located near the display screen. Pressing one of the one or more buttons may cause the processing device to perform a first function and pressing and holding the one of the one or more buttons may cause the processing device to perform a second function. When the one of the one or more buttons is pressed, the processing device may provide a first feedback describing the first function. When the one of the one or more buttons is pressed and held for at least a predetermined amount of time, the processing device may provide a second feedback describing the second function. In some implementations, a time indicator may be displayed indicating an amount of passing time until the one of the one or more buttons is pressed and held for the predetermined amount of time.
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