[ti:UNIT 4 Work for Peace Lesson 27 The Dove and the Olive Branch] [0:00.498]UNIT 4 第四单元 [0:02.277]Work for Peace 为和平而努力 [0:04.672]Lesson 27: 第27课: [0:06.635]The Dove and the Olive Branch 鸽子和橄榄枝 [0:07.855]Do you...