I'm not sure if I'm going to be able to do that.

Previously, we used to study at that time will often test to, now I do not know whether the test. It's a source of pride for the Chinese people, so you should know whether or not it's on the test. In recent centuries, the inventions that affect people's lives are almost all made by foreigners, and China has nothing to do with them, such as airplanes, trains, automobiles, movies, electric lights, telegraphs, telephones, cell phones, computers, and even rice cookers and frying pans for cooking, etc. They were all invented by foreigners first. The only thing that our country can take credit for is the four great inventions of ancient times.