What does it mean that Qi Jin is cool in summer?

It means: in the mountains in July, osmanthus flowers have already bloomed, and the breeze is blowing gently and the coolness is blowing. "Seven hibiscus flowers are cool in summer" is a poem by China, which comes from the poem "In the Summer Mountain" by the poet Du Fu in the Tang Dynasty: "Seven hibiscus flowers are cool in summer, and the mountains are empty and clear, among which" seven hibiscus flowers "means" sweet-scented osmanthus "and" cool in summer "expresses the cool atmosphere in summer. The whole poem depicts the cool and pleasant scenery in the mountains in summer, giving people a fresh and comfortable feeling. This poem has been handed down to this day and has become a classic sentence describing summer scenery.