六级The US has already lost more than a third of the native languages that existed before European colonisation, and the remaining 192 are classed by UNESCO as ranging between unsafe and extinct.

美国已经失去了欧洲殖民前三分之一以上的本土语言，其余192种被联合国教科文组织归类为不安全语言和灭绝语言。

2016年6月听力原文