- It was a spoken code, never written down and it was developed and used by Navajo Indians.
2018年6月六級真題(第二套)聽力 Section B
- Navajo is hard to learn and only a few people know it.
2018年6月六級真題(第二套)聽力 Section B
- They were called the Navajo code talkers.
2018年6月六級真題(第二套)聽力 Section B