Duoduo fell down and cried loudly on the ground.
Mother hugged Duoduo distressedly and said that it was because of the uneven ground that Duoduo fell.
But what is "concave" and what is "convex"? Duoduo doesn't understand.
So my mother took Duoduo to make gestures with her hands,
After experiencing it and talking at the same time, Duoduo finally understood "concave" and "protrusion".
Not only that, Duoduo also found a lot of "concaves" and "protrusions".
Little babies, let's experience it with Duoduo!
Concept: Use movement to experience language
