photoplethysmograph

例句：

1. 1. The photoplethysmographwas used to monitor the patient'sheart rate during the procedure.
   使用光血流量计监测患者手术过程中的心率。
2. 2. Thestudy used a photoplethysmograph to measure the oxygen saturationlevels in the lungs.
   研究使用了光血流量计来测量肺部的氧饱和度水平。
3. 3. The doctor explained that the photoplethysmograph would help himdiagnose the patient's condition more accurately.
   医生解释说，光血流量计将帮助他更准确地诊断患者的病情。