Autumn's first frost. China's vast territory, complicated terrain, the early frost in different parts of the north as early as in the south, inland as early as coastal areas, mountains earlier than plain. Case of frost in autumn crops, the growth was inhibited, or even death.
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No. 3
First occurrence of frost. Wei Jia Sixie "Arts for the People kind of pear": "received after the first frost, dig as deep in the house under the shade, bottom not so wet, to close home in the pear." Southern Emperor Jianwen "Autumn Gui Night" Poetry: "The first frost rainstorm Egeria, autumn drive firefly chaos."
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No. 4
That occur when the first frost. Tang Li Bai, "Lu Pu Dong Men View Clipping" Poetry: "Lu cold matter as early as the first frost mow Sugama."