千变万化 (qiān biàn wàn huà): countless changes; constant permutation

The sea of clouds in Huangshan is ever-changing; a moment ago it was calm, and in the blink of an eye it turned into rolling waves.

Fashion trends are constantly changing; what was popular last year might be out of date this year.

A child's face is ever-changing; just now he was crying, and now he is laughing again.

The skyline of this city is constantly changing; new buildings spring up every year.

Life is always full of changes; we need to learn to adapt to new environments.

The stage lighting changes in countless ways, bringing a stunning visual effect to the audience.