The four ancient civilizations are the collective names of the four ancient civilizations in the world. The four ancient civilizations of ancient Egypt, ancient Babylon, ancient India and ancient China actually correspond to the birthplaces of the world's four major civilizations, namely, the Nile Valley, the Two Rivers Valley, the Indus Valley and the Yellow River Valley, and the first four large-scale human civilizations were born, but the later Aegean civilization was not included. Indian, Greek and China civilizations have never been interrupted.

China has:

The world's earliest copper smelting technology, the world's earliest agriculture, the world's earliest shipbuilding technology, the world's earliest brewing technology, the world's earliest musical instrument, the world's earliest philosophical works, and the world's earliest military works.

In ancient India, there were:

The world's earliest trigonometric function, the world's earliest Heliocentrism, the world's earliest systematic religion.

Ancient Egypt has:

The earliest unified dynasty/empire in the world, the earliest mathematics in the world, the earliest geometry in the world, and the earliest special writing tools in the world.

Two rivers civilization:

The world's earliest human civilization, the world's earliest writing, the world's earliest city, the world's earliest smelting practice, the world's earliest bronze smelting technology, the world's earliest iron civilization, the world's earliest calendar, and the world's earliest systematic religion.