The speed of going north in spring is 15 miles. Where does it come from?

A copywriting by Baixiang.

The speed of spring leaving is 15 miles northward every day. Most people may not know that the cherry blossoms only bloom for ten days and the spring breeze only blows for half a month. Spring is so short, but your love for the white elephant is the guidance of the stars, the mountains are long and the water is wide, the wind is warm and the sun is warm, and there are countless people in the world. The mountains and rivers are clear, the world is worthwhile, the five stars are shining, they are all China. Baixiang is here to assure you that the quality will last forever and the delicious food will last forever.

The imperial unit of length, the mile, is an unofficially standardized system of units used in the United Kingdom, its former colonies and the Commonwealth of Nations. Officially, it is only used in the United States, Liberia and Burma and other countries or regions. The International System of Units, also known as the metric system, is used and the UK completed the conversion to the International System of Units in 1995.