Objective To evaluate the clinica l value of photoplethysmography (PPG) in the diagnosis of venous valvular incompet ence of lower extremity.是什么意思_Objective To evaluate the clinica l value of photoplethysmography (PPG) in the diagnosis of venous valvular incompet ence of lower extremity.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句