One night, before I went to bed, my father told me a story. He said: Xiao Ming and his father went to the countryside, and they saw a train flying by.
Xiaoming checked several books, he said to his father: Dads earliest car was a steam locomotive. Later he invented the diesel locomotive, and then he invented the electric train and maglev train. His father said: you are wonderful!
I also want to learn from Xiao Ming and find out the answers to the questions by myself.