[Explanation]: Mulberry field: farmland. The sea becomes a mulberry field, and the mulberry field becomes the sea. The metaphor is that things change a lot.

[Idiom Story]:. Legend has it that Wang Fangping, an immortal of the Eastern Han Dynasty, saw the fairy Magu at the house of his disciple Cai Jing and found that it was his sister.

In her early years, she practiced in Guyu Mountain, thousands of years have passed, she still looks like an eighteen or nineteen-year-old girl, with sideburns coiled on the top of her head, her hair hanging down to her waist, and the clothes on her body are dazzling.

This time I went to Penglai, Xianshan, and saw that the sea water was much shallower than before, and it was probably about to become a land hill again!

Wang Fangping said with a smile: No wonder the sage said that the road in the sea will be dusty. The vicissitudes of the sea refer to the sea becoming mulberry fields, and mulberry fields becoming the sea.

The metaphor is that things change a lot.

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