The expression of numerical units in German is different from that in Chinese. It can be divided into 10, 100, 100, 1000, millions, billions and trillions. 999.9 billion means 999.9 billion in German. This is purely a matter of habit, just as Germans need an adaptation process to learn Chinese numeral expression. However, the number expression in Europe does have a great advantage, that is, no matter how long the standardized written numbers are, they can be read almost immediately, which is conducive to the writing of mathematical formulas. For example, 356 2 1 1 000, you can see at a glance that there is 100 million units ahead. The key is that there will always be a new unit in every three places from the beginning of the Millennium. If there were three more people a billion years ago, it must be one trillion. Even if it's only two, you can identify it as ten according to the fact that three is one hundred, so you can read (count) ten billion at once.

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