The last paragraph of the text, Cicada, used a metaphor to compare cicadas with the moon, emphasizing their similarities. It vividly and figuratively expressed the author's observation and feelings towards cicadas. Metaphor is a rhetorical device that makes an abstract concept or image more concrete, vivid, and easy to understand by comparing two or more things. It allows the reader to better feel the author's feelings and thoughts. In the text, Cicada, the author vividly expressed his love and reverence for cicadas by comparing cicadas with the moon through his observation and feelings towards cicadas. At the same time, it also allowed the readers to understand the author's views and feelings more deeply.