Extinct

英 [ɪkˈstɪŋkt]；美 [ɪkˈstɪŋkt] ^[1] 

extinct language絕跡語言 ; 死語 ; 滅絕語

extinct nuclide衰減核素

extinct book絕版書 ^[1] 

1、It would be unfair to clone any extinct animals if they could have to live in a zoo.

克隆的任何滅絕的動物，如果它們必須生活在動物園裏，那是不公平的。

2、But no government wants to see the tiger, an emblem of India, go extinct on its watch.

但是沒有哪屆政府希望看到印度的象徵之物——老虎在其任期內滅絕。

3、Whatever the cause, dinosaurs, as well as about half of all species on the planet, went extinct.

不管什麼原因，恐龍以及地球上幾乎半數以上的物種就這樣滅絕了。 ^[1]