There is a river in China, the Yellow River, it is nicknamed China's Sorrow. Do you know why?
When I was really young I acquired a nickname, it was Cass. Short for Cathi. When you are young sometimes it is difficult to pronounce the 'th' sound in words, so I called myself Cass. I don't think anyone outside of my family ever called me Cass because we moved so much and I never had the same friends for very long.
Do you have a nickname? How did you earn it? Try to answer the question: why do the Chinese call the Yellow River, China's Sorrow?