Ergonomically speaking, users hold touchscreen mobile devices in a way that the thumb position is typically pointed towards the middle of the screen.
从人体工程学上讲，用户手握触屏手机设备时，拇指位置通常指向屏幕中部。
The thumb position is always a discrete integral value.
滑块位置总是一个离散的整数值。
The thumb position is always a discrete integral value.
滑块位置总是一个离散的整数值。
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