科普知识与科学技术
历史上有很多发明，起着很重要的作用，其中一些改变了世界。依你之见，什么是最重要的发明，并说明原因，也就是它起的作用（不少于三点）。80词左右。
The Most Helpful Invention
There are a lot of inventions in the history. Some of them play an important role in people’s life and some have greatly changed the world.
In my opinion, I think the most important invention is the car. First, people used to travel by train or by plane. But now, they can go any place by car. Second, when holiday comes, they can visit their family and friends by car. Third, they can also go to many places of interest to enjoy themselves.
In a word, I do agree that cars are the most important invention.