pulse beetle

例句：

1. 1. He felt a sudden surge ofenergy as his heart began to beat faster.
   他的心脏开始快速跳动，他感到一股突然的活力。
2. 2. The doctor checked her pulseand found it to be steady.
   医生检查了她的脉搏，发现它很稳定。
3. 3.She noticed that her pulse was racing,despite the calm surroundings.
   尽管周围环境平静，她注意到她的脉搏在加速。