Photoplethysmograph
光体积描记器
🗣️ 情景例句
Oh. Now all it has to do is stop raining.
噢。现在唯一希望的就是停止下雨。
How long have you stayed there?
你在那儿住多久了？
We are happy to be of help.
我们十分乐意帮助。