pulse time division system

例句：

1. 1. He felt his pulse quicken as he ran up the stairs.
   他跑上楼梯时感觉到自己的脉搏加快了。
2. 2. The doctor checked her pulse to makesure she was still alive.
   医生检查了她的脉搏，以确保她还活着。
3. 3. Herheart raced as shewaited for the results of thetest.
   她在等待测试结果时心跳加速。