From an ancient poem by Li Bai, a poet in the Tang Dynasty, "It's Difficult to Go to Heaven", the whole poem is as follows:
The cost of pure wine is a gold cup, 10 thousand copper coins and a hip flask, and I am ashamed of 10 thousand yuan.
I threw the food bar and cup aside. I couldn't eat or drink. I pulled out my dagger. I peeped in four directions in vain.
I want to cross the Yellow River, but ice will block the ferry and Taihang Mountain will be covered with snow.
I will sit on a fishing rod and lean lazily by the stream, but I suddenly dream of sailing a boat towards the sun.
Travel is hard. Travel is hard. Don't go astray! Where to go today.
One day, I will ride the wind and waves, raise the Yun Fan and cross the sea.