What are the sentences that illustrate the method?

Stone arch bridges can be seen almost everywhere in China. These bridges vary in size and shape, and many of them are amazing masterpieces. The most famous ones are Zhao Zhouqiao in Zhao County, Hebei Province and Lugou Bridge in Fengtai District, Beijing. -Mao Yisheng's "China Stone Arch Bridge"

2. Suzhou gardens pay attention to the beauty of every corner. There are some books with grass beside the steps. The wall is covered with ivy or rosewood. -Ye Shengtao's Suzhou Garden

Clouds can predict the weather. For example, in Xinjiang, the appearance of clouds means rain. -Zhu Yongxi, "Seeing the Clouds and Knowing the Weather"

As for white flowers, it is because there is no pigment in cell fluid. Some white flowers, such as chrysanthemums, are reddish before withering, indicating that they also contain a small amount of anthocyanins. -Jia Zuzhang, "Why are flowers so red"

5, such as Dahlia, native to Mexico, only eight red petals. The history of artificial cultivation is only two or three hundred years, but there are thousands of varieties with different shapes and colors. -Jia Zuzhang, "Why are flowers so red"

Extended data:

Example usage requirements:

First, examples should be consistent with the content of the problem explained, not specious, not arrogant, otherwise it will not play a role in explaining the characteristics of things.

Second, the examples should be as typical, influential and representative as possible to enhance the explanation effect.

Third, examples should be easy to understand, especially in scientific and technological discussions, which make people feel credible, can better explain the characteristics of things, and the language expression is just right.