I guess you need to make sure to get ahead of everyone...

It often involves long hours of travel by train, bus, car, or plane, which can pose health risks such as deep vein thrombosis (also known as \"economy class syndrome\") due to prolonged sitting.

The return trip after the Spring Festival, known as the \"Spring Festival travel rush\" or Chunyun, is considered the largest annual human migration in the world because hundreds of millions of Chinese people travel back to their hometowns for family reunions during the holiday and then return to their workplaces in cities.