pulse communication system

例句：

1. 1. He was having a bad time with his pulse racing.
   他的脉搏在快速跳动，他正经历一段艰难的时期。
2. 2. The doctor checked her pulse to make sure she wasn't having a heart attack.
   医生检查了她的脉搏，以确保她没有心脏病发作。
3. 3. She took a deep breath and counted her own pulse before speaking.
   她深呼吸并数着自己的脉搏，然后才开口说话。