Back 【解題】用平平的面和彎彎的面來分類 登入觀看 ⇐ Use this menu to view and help create subtitles for this video in many different languages. You'll probably want to hide YouTube's captions if using these subtitles. 【解題】用平平的面和彎彎的面來分類 上傳學習單 下載學習單