What's the difference between the upper limit and the median?

Simply understood, "Shangshu" means that billion is trillion, trillion is Beijing, and billion is carry; The median refers to trillion as trillion, ten trillion as Beijing, and ten thousand as decimal point.

Just like the old society said that China had a population of 40,000, now it says 400 million.

However, the entry has been changed. After the change, the "upper number" is no longer a decimal, but directly takes the largest number, and it is absolutely one billion, one billion is trillions, and trillions is Beijing.