Kao, electric, fire, ke, stone, banban, the eight characters form two idioms.

Electric light stone fire diàn Guāng Shí huǒ

[Definition] Like the light of lightning; like the fire of flint, it flashes by. Metaphor that things disappear quickly. Also described as extremely fast.

[Quotation] Shi Daoyuan of the Song Dynasty "Jingde Chuan Leng Lu": "Stone fire and lightning; it has been a catastrophe.

[Similar meaning] The electric light and morning glow are fleeting. They appear in the blink of an eye.

[Antonym] The earth is long and the sky is long-lasting.

The spots can be tested.