載入中... 相關課程 Back tight: 緊的, tighten, 使...變緊, loose, 鬆的, loosen, 使...變鬆 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. tight: 緊的, tighten, 使...變緊, loose, 鬆的, loosen, 使...變鬆 上傳學習單 下載學習單