Why do some languages disappear while others thrive?

为什么有些语言消失而其他语言繁荣？

同一单元的其他句子

• English is spoken by millions of people around the world.全世界有数百万人说英语。
• How many languages are there in the world today?当今世界上有多少种语言？
• Learning a foreign language can open many doors for you.学习一门外语可以为你打开许多大门。
• Mandarin has the largest number of native speakers.普通话拥有最多的母语使用者。
• Do you think English will remain the global language?你认为英语会一直是全球性语言吗？