載入中... 相關課程 Back frail (adj.) 虛弱的 相關課程 0 / 750 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. frail (adj.) 虛弱的 上傳學習單 下載學習單