pulse EHT generator

例句：

1. 1. The doctor checked his pulse to make sure he was still breathing.
   医生检查了他的脉搏，以确保他仍然在呼吸。
2. 2. She felt a pulsing in her chest and knew she needed to see a doctor.
   她感到胸口有跳动，知道她需要去看医生。
3. 3. He had a pulsing headache that wouldn't go away.
   他有一个持续的头痛，无法缓解。