This year, we've learned that almost nothing is guaranteed in life. And yet, as summer turns to autumn, one thing that is certain is the leaves changing color.
원문출처 : https://www.cnn.com/travel/article/why-leaves-change-color-scn/index.html
원문출처 : https://www.cnn.com/travel/article/why-leaves-change-color-scn/index.html