retraction mapping

例句：

1. 1.The retraction mapping of the data indicates a significant decrease in sales.
   数据回缩映射显示销售额显著下降。
2. 2.The contraction mapping shows that the economy is recovering from the recession.
   收缩映射显示经济正在从衰退中恢复。
3. 3. During the mapping process, we need to consider the impact of various factors on the data.
   在映射过程中，我们需要考虑到各种因素对数据的影响。