This is a small train. How to introduce children?

1, first put the picture of "train" to guide children to know trains.

2. Secondly, what kind of car is this? (Train), what's the difference between a train and other cars?

3. Finally, it is concluded that the train is also a means of transportation, and the car is different. There are several carriages dragging behind the front of the car, which connects the children together and becomes a long train.