In the structure of the poem "North", which two parts can it be divided into? And write the general idea of these two parts.

north

Ai Qing

Poets on Horqin Grassland

Say to me:

"North sorrow."

Not bad,

The north is sad.

Blow from the outside of the plug.

Desert wind,

It's already gone

The Green of Life in the North

And the glory of time,

-Dark grayish yellow,

Covered with a layer of sand fog that can't be opened;

That day, the roar of Pentium,

Brought fear,

like mad

Sweep the land

Desert Yuan Ye

Frozen in the cold wind of October;

This village,

Ancient city,

On the hillside,

Riverbank,

Collapsed walls and deserted graves,

Covered with earthy melancholy ...

Lonely pedestrians,

Upper body leaning forward

Cover your cheeks with your hands,

In the wind and sand

Difficulty breathing,

one by one

Struggle forward ...

A few donkeys

-With sad eyes.

A beast with tired ears,

Carrying land

The weight of pain,

Their tired footsteps,

go slow

the north

A long and lonely road ...

Those rivers have dried up long ago.

Cars were painted on the bottom of the river,

The land and people in the north

yearn for

The fountain that nourishes life!

Withered tree

Low-rise residence,

filmy

Gloomily

Scattered in

Under the gloomy sky;

In the sky,

Can't see the sun,

Only geese form a large group.

Wild geese in chaos,

Flapping its black wings,

Talk about their anxiety and pain,

Escape from this desolate area,

Escape to

The south, where the green covers the sky, has disappeared. ...

The north is sad;

Yellow River in Wan Li

Surging waves,

Go to the vast north

Pour out disasters and misfortunes;

And the wind and frost of the age,

depict

The vast north

Poverty and hunger.

but I ...

-This passenger from the south,

But love this sad northland.

blowing sand

The cold wind is biting,

Never let me curse;

I love this sad land,

The endless desert,

Also aroused my reverence:

-I see

Our ancestors

Leading the sheep,

Attack the flute,

Immersed in this desert dusk ...

We are moving forward.

Ancient

In the soft loess layer,

Buried with the bones of our ancestors,

They cultivated this land,

Thousands of years.

They're here.

Fighting against the nature that has hit them,

They defended the land.

Never been humiliated.

They are dead.

Leave us the land—

I love this sad land,

Its vast and barren land,

Bring us simple words

In a broad posture,

I believe: this speech and gesture

Live strong on the earth,

Never perish;

I love this sad land.

Ancient land,

This land has nurtured

This is what I like.

The hardest thing in the world

The oldest race.