In our everyday life, we can see inventions everywhere. It is so hard to imagine what life will be like these inventions, like cars, computers, televisions or zippers. Even the smallest inventions can make a big difference to (we) life. The bar-code (条形码) is one of (useful) inventions. If you want to know the information of the (product), you can scan the bar-code with your smart phones. But do you know how the bar-code was invented? Here is something about it.
In 1984, an owner of a small food store found difficult to record the inventory (详细目录) and prices. he wanted to find a way to solve the problem. At last, Bernard Silver and a group of students from the institute set up bar-code system to solve the problem. The good news was that Bernard Silver took up the challenge and began to work on it. In order (protect) the invention, Bernard and his classmate Woodland decided to get a patent(专利). It (take) them about three years. Finally, on October 7th, 1985, they got the patent. And the inventions (use) by many people around the world today.
