英语作文:最有用的发明30~40词!

The most useful Invention
We knew there had been many inventions last century,for example,telephone,phonograph,airplane,computer and so on.What’s the most useful invention?I think the most useful invention should be telephone.With invention of the telephone in 1876,the people who live in eastern and western hemisphere seemed nearer and nearer to live.The most usuful invention was invented by Alexander Gray Ham Baer.Many young people admire Baer.If we study hard now,we can invent something useful for the world in the future.