It's also white dew today, it's not raining, but it's still hot, and there's no possibility of frost. Now he already knows that the reeds are reeds that grow in large numbers in the north, where white dew will form frost. The editor of that book is Confucius, who is from Shandong. He may have never been to T city in the south in his life, so he doesn't know that the white dew here is very hot, and it will rain, but there will be no frost...
Intention: