1 die out

(1) The English of today is very different from the English of 500 years ago. In time, some even die out completely. 现在的英语与500年前的英语已大不相 同，有一些甚至会在今后完全消失。 (2) No one has come up with a convincing explanation of why the dinosaur died out. 尚未有人能对恐龙的灭绝做出一个令 人信服的解释。

灭亡；逐渐消失