"The Time Machine" tells us that the world is four-dimensional, and any entity must extend in four directions, it must have length, width, thickness and duration in time. The time traveler invented the time machine and used it to take me on a wonderful journey through time, allowing me to see the great changes that had taken place on Earth 80,000 years later. At that time, except for humans, all other mammals were extinct, and there was a terrible phenomenon of man eating man.

Through reading this book, I have learned the basic principle of material existence, and I know that all existing entities should be objective. Moreover, human research is only a very small part of the whole field of science, and there are most of the fields that human beings do not understand at present, human power is very small, we should respect nature. When I grow up, I will also explore the unknown areas of human beings and study more principles of time and space.