What idiom can you use when the weather rises and falls for a while?

Pinyin: bi à n hu à du not du ā n

Description: end: clue. Describe a great change. It also means a lot of changes.

Source: Meng Long's "Ancient and Modern Novel Chen Meiling's Lost Family": "This great sage in heaven is full of magical powers and changes."

Example: Old friends are changeable, and there are hardly any left.

Pinyin code: bhdd

Synonym: make persistent efforts and be unpredictable.

Antonym: unchangeable, a spent force, as always.

Two-part allegorical saying: There are clouds in the air; June cloud, girl's heart.

Lantern riddle: autumn clouds

Usage: as predicate and attribute; There are many ways to describe change.