Opportunities, ups and downs of personnel, are fickle, and sometimes change to the opposite side. It is unpredictable, that is, good people will not belong to you forever, and neither will good luck.
Being with you forever, good things will not happen to you forever. Your life can't be smooth sailing forever, and you can't drink cold water.
When you feel that you can also plug your teeth, it means the same thing as thirty years in Hedong and thirty years in Hexi, indicating that people's lives are ups and downs.
Life is a restless life, a life that will not be static. To put it bluntly, you are lucky now and I am unlucky, but you won't be like this forever.
With luck, I will never be unlucky. There will always be an upside down day. It's my turn to be lucky, but you're unlucky.