Sanatorium



During the Han Dynasty in China, there was a famous doctor named Dong Feng. He healed his patients without accepting any money, but only asked each of them to plant an apricot tree for him in return.  Those who suffered from serious illnesses, if they recovered, he asked them to plant five.

In a few years, there were already ten thousand apricot trees planted. 
From then on, the term "Apricot Forest" also came to refer to the medical world.