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.
出自-2016年6月聽(tīng)力原文
Some polar animals will soon become extinct.
出自-2010年12月聽(tīng)力原文
Altogether there are some ten thousand of these volcanoes on earth, all but a few hundred of them extinct.