Make sure we have enough space to draw the progress bars! This is done by writing "\n" * count when the function starts. This creates a series of newlines that makes the terminal scroll, ensuring that there are exactly count blank lines at the bottom of the terminal for the progress bars to be rendered on
日前，国能宁夏灵武400万千瓦光伏电站投运，可年产绿电68亿千瓦时。很难想象，这片充满生机的光伏基地，曾是一片采煤沉陷区。，详情可参考快连下载安装
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Add a callback that's called when the value changes.