plethysograph

例句：

1. 1. Theplethysmograph was used to monitor the patient's heart rate.
   使用脉搏描记器来监测病人的心率。
2. 2. The doctor ordered a blood test to check for any abnormalities in the patient's plethysmograph readings.
   医生下令进行血液测试，以检查病人的脉搏描记读数是否有任何异常。
3. 3. During the surgery, the plethysmograph was used to monitor the patient's vital signs.
   在手术期间，脉搏描记器被用来监测病人的生命体征。