How to understand the "tree" in Ai Qing's poems?

1, "Tree" Ai Qing

A tree, a tree

Stand apart from each other

Wind and air

Tell them the distance

But under the cover of soil,

Their roots are growing.

In the unseen depths

They twisted the roots together.

2, "I love this land" Ai Qing

If I were a bird,

I should also sing with a hoarse throat:

This land hit by the storm,

This river of sadness and anger will surge forever,

This endless wind,

And the gentle dawn from the forest ...

And then I died,

Even feathers rot in the ground.

Why do I often cry?

Because I love this land deeply. ...

3, "Umbrella" Ai Qing

In the morning,

I asked the umbrella:

"Do you like the sun?

Or do you like rain? "

The umbrella smiled,

It says:

"That's not what I was thinking."

I asked it:

"Then what are you thinking?"

Umbrella said:

"I was thinking-

Don't let everyone's clothes get wet on rainy days;

On sunny days, I am the cloud above everyone. "