How to write the end of amber commentary?

The commentary of the amber text ends with "After tens of thousands of years, the turpentine balls wrapped by two bugs have become crystal clear and priceless amber".

The primary school "Amber" text is a scientific associative composition, which is based on the practical scientific imagination.

At the beginning of the text, it is said that this is a story that happened a long time ago. Then, with vivid words, it tells the process of wrapping flies and spiders with turpentine balls and turning turpentine balls into fossils. Then, the process of a father and son discovering fossils at the seaside is introduced. Finally, briefly write out the thinking caused by this.

In this paper, the formation process of amber is not explained abstractly by scientific knowledge, but by vivid storytelling.