Photoplethysmograph
光體積描記器
??? 情景例句
Can what?
能做什么？
It's hopeless!
這下沒指望了！
Among these I would list string and brown paper, kept by thrifty people when a parcel has been opened, to save buying these two requisites.
這些東西中我想舉出線繩和包裝紙為例。節儉的人們打開包裹后便把這兩樣必備的東西收藏起來。省得日后去買。