Looking back at this poem by Bing Xin, what is the main expression?

By contrast, it is different from adults to see the world with childlike innocence and childlike innocence.

review

Three very young children,

A row sat by the ditch beside the tree,

Look at each other with a smile-wait.

Clap your hands and sing alone,

Two people also hurriedly clap your hands to sing;

It stopped again—

Still smile at each other-wait.

Dust all over the street

Pedestrians are woven,

They created their own natural world!

Just three ordinary children,

But it won me three comments.

1April 922 17.