opposite direction pulse

例句：

1. 1. The device measures the electrical activity of the heart in the opposite direction to that of the normal heartbeat.
   该设备测量心脏的电活动，与正常心跳方向相反。
2. 2. The researcher found that the opposite directional pulse could be used to detect early signs of disease.
   研究者发现，相反方向的脉冲可以用来检测疾病的早期迹象。
3. 3. In this study, we investigated the effect of opposite directional pulse on the growth of plantlets.
   在这项研究中，我们探讨了相反方向脉冲对植物幼苗生长的影响。