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The evolution from "strategy" to "microfilm" has experienced a long history of seventeen years. What is the decisive factor of this evolution?
The development of science is the crystallization of the wisdom of the people of the whole country.

The answer is,

First, the books are different in size; second, the Raiders are large in size and difficult to carry, while the Microfilm Books are small in size and convenient to carry.

20. List the figures for comparison.

2 1. Through examples, it is intended to explain that "some books are getting smaller and smaller now".

22. Development of science and technology.

23. "General" means "reduced to 1/48 of the original book size" in general, but some special cases, such as less than 1/48, are not excluded, which embodies the characteristics of accurate and rigorous description language.

24. You can introduce the characteristics of e-books.

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