[ti:UNIT 3 Families Celebrate Together Lesson 21:Happy Thanksgiving!] [0:00.958]UNIT 3 第三单元 [0:02.525]Families Celebrate Together 全家一起庆祝 [0:05.224]Lesson 21: 第21课: [0:07.227]Happy Thanksgiving! 感恩节快乐! [0:10.274]T...