disappears when extract returns.
// 逻辑：这些数比当前元素小/相等，不可能成为「左侧元素的下一个更大值」，直接移除
。关于这个话题，旺商聊官方下载提供了深入分析
For example, using DECSTBM you could say “set the top margin to line 5 and the bottom margin to line 10, then scroll up 1” - this “scrolls” the region you’ve described by deleting line 5, shifting everything else in the region up by 1 line, and inserting a new line at line 10.
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