pulse jitter

例句：

1. 1. He was having a hard time keeping his pulse steady.
   他很难保持他的脉搏稳定。
2. 2. His heart began to throb with anxiety.
   他的心脏开始因焦虑而跳动。
3. 3. The doctor noticed that her pulse was irregular during the exam.
   医生注意到她在考试期间脉搏不规则。