pulse back edge

例句：

1. 1. The surgeon carefully removedthe tissue around the pulse back edge ofthe heart.
   外科医生小心翼翼地切除了心脏周围组织的脉冲回缩边缘。
2. 2. The team workedtogether to maintain a pulse back edge ofsafety in their operations.
   团队共同努力，确保操作中保持安全的边缘。
3. 3. The researcher found that the pulseback edge of the data wascrucial for understanding the phenomenon.
   研究者发现数据脉冲回缩边缘对于理解这一现象至关重要。