Counting treasures means being very familiar with the things listed or the stories told, just like counting the treasures in your own home.

Rushujiazhen is usually used to describe knowing a certain situation very well, and an insider or expert can tell the details. The origin of this idiom can be traced back to ancient Chinese allusions. It is said that at some time in ancient times, there was a collector who valued his collection very much and knew every piece of it well.

Whenever someone wants to know about his collection, he can always accurately tell the origin, characteristics and other details of each collection, just like counting the treasures in his own home. Therefore, later generations used the idiom "Rushujiazhen" to describe a person who has a thorough understanding of things and knows the details like the back of his hand.

In modern Chinese, rushujiazhen is often used to describe someone who is very familiar with a certain field or topic and can list the key points or details in detail. For example, a senior football commentator may have a very good understanding of each team's history, player status, tactical characteristics, etc., and be able to describe it in detail.

Extensive knowledge can also be used to describe someone who is very familiar with certain things or topics, even beyond the level of professionals. For example, an ordinary viewer may know the director, actors, plot, etc. of a certain movie very well, and can tell it in detail.

Sentences with countless treasures:

1. Every time a tourist attraction is mentioned, Lao Zhang can always describe its history, culture, landscape and characteristics like countless treasures, which makes people happy. People were very interested when they heard it.

2. As a senior fan, Xiao Wang has a very good understanding of the players, tactical characteristics, etc. of each football team. He can be called a treasure trove.

3. Xiao Li is very knowledgeable about the preparation methods and taste characteristics of various delicacies. Every time friends gather to order food, he is always able to give a lot of advice like a treasure trove.

4. Whenever the acting experience of a certain star is mentioned, Lao Chen can always tell their works, award-winning experiences and life stories in detail, which makes people feel very admired.

5. Xiao Wang is very knowledgeable about the names, characteristics, and maintenance methods of various flowers. .