心跳的

例句：

1. 1. She felt her heartbeat quicken as she walked up the stairs.
   当她走上楼梯时，她感觉到自己的心跳加快了。
2. 2. He took a deep breath and counted his heartbeats to calm himself down.
   他深呼吸并数着自己的心跳来使自己冷静下来。
3. 3. The doctor checked her heartbeat to make sure it was normal.
   医生检查了她的心跳以确保它是正常的。