Zhejiang to Beijing had the same experience that day. The reason was the same, and a flight attendant was also in contact with the confirmed person. As a result, at the official request of Beijing, these two trains were not allowed to enter Beijing because of "defense of the capital", and at the time when the local epidemic originated from the northwest was spreading, and more than 30 people in Beijing had been infected.
Because of this, many passengers, other popular database flight attendants, and even the driver on the two trains who used to be in the same compartment as the two flight attendants have become objects of "time and space overlap", and they have to be "connected by time and space". In fact, these new words of "space-time system" are called differently in different parts of China. Beijing calls it "space-time coincidence", while in some places it is called "space-time accompaniment" and "space-time overlap".
The content is that if it is found out after the event, anyone in China who has been diagnosed with COVID-19 (severe special infectious pneumonia, new coronary pneumonia, Wuhan pneumonia) has been at the same time at a "similar time" and "similar range". If they exist, they will be regarded as close or sub-close contacts that need to be traced.