The whole sentence of jiaozi's doggerel is: jiaozi's crouching face, pancakes roll eggs, and there is a slang in the north, which is called "jiaozi's crouching face, pancakes spread eggs".

There are three kinds of food in the proverb, namely jiaozi, noodles and pancakes and eggs. You may be curious about why you eat these three kinds of food, so you might as well look down.

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As early as in "Wei's Spring and Autumn Annals", there was a description: "When you lie in the sun, you will get a towel to wipe your sweat, and your face will be Jiao Ran". In ancient times, people called boiled pasta "soup cake", which shows that the custom of "eating boiled pasta" has existed since ancient times.

There are head, middle and last days in the dog days. The head has 10 days, the last has 10 days, and the middle has 10 days or 20 days. The annual lodging time is not fixed. When will the dog days start in 2022, July 16?