是extinction:

n. 灭绝；消失；消灭；废止

The extinction of this rare plant has attracted national attention.

这种稀有植物的灭绝引起了全国的注意。

The mountain gorilla is on the verge of extinction.

居住在山区的大猩猩已濒临灭绝。

They have driven the rhino to the edge of extinction.

他们已经把犀牛逼到了灭绝的边缘。

In the 19th century, inbreeding nearly led to the extinction of the royal family.

19世纪，近亲婚配几乎导致了皇室宗族的灭绝。

The loggers say their jobs are faced with extinction because of declining timber sales.

樵夫们说他们的工作因不断下降的木材销售而面临消亡。