載入中... 相關課程 Back rational [`ræʃənḷ] adj. 理智的;合理的 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. rational [`ræʃənḷ] adj. 理智的;合理的 上傳學習單 下載學習單