Native American languages are indeed different, so much so in fact than Navajo could be used by the US military as a code during World War II to send secret messages.

• 实际上美洲土著语言是与众不同，太与众不同了，以至于纳瓦霍语言在第二次世界大战中被美国军方用做发送机密情报的密码。