Idioms about autumn are in English.

Quite critical: you can judge the arrival of autumn from the fall of a leaf. For example, you can see the development trend and result of the whole situation through personal subtle signs.

Crisp autumn: describe Wan Li with clear autumn sky and cool and pleasant climate.

Autumn is pleasant: autumn scenery. The scenery in autumn is very beautiful, which makes people relaxed and happy.

Deciduous leaves know autumn: When you see yellow leaves falling on the ground, you will know that autumn is coming.

Clear clouds and autumn moon: When the air is crisp in autumn, white clouds float and the bright moon is in the sky.

When the leaves fall, you know that autumn is coming.

Weather in first frost: The metaphor is awe-inspiring, as severe as autumn frost.