forward twin pointer 向前孪生指标
physical twin pointer [计] 物理双指示字
logical twin pointer 逻辑指针
child and twin pointer 子指标与孪生指标
LTB Logical Twin Backward pointer 逻辑双反向指针
physical twin backward pointer 实体双反向指针
logical twin backward pointer 逻辑双反向指针
logical twin forward pointer 逻辑双正向指针
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