pulse length

例句：

1. 1. The doctor measured the patient's pulse length to determine his health condition.
   医生测量了患者的脉搏长度来评估他的健康状况。
2. 2. During the race, the athlete monitored his pulse length to ensure he was maintaining proper breathing.
   在比赛中，运动员监测了他的脉搏长度以确保他保持正常的呼吸。
3. 3. The scientist observed the animal's pulse length to study its heart rate variability.
   科学家观察了动物的脉搏长度来研究其心率变异性。