is to bring attention to the number of animals and places that have either disappeared or will disappear in our lifetime.

VOA: special.2009.05.06

Or the house made its money and all of a sudden suddenly disappeared.

要么庄家赚足了钱,然后突然消失。

斯坦福公开课 - 经济学课程节选

It has some grammar structure and words from several other languages that are unknown or that have disappeared.

VOA: special.2009.12.02