Do the staff who seal the epidemic usually post it at night?

The staff who posted the epidemic seal didn't come to post it at night.

The sealing time is not fixed.

A note posted when a door or appliance is closed, which indicates the date of closing and is stamped with a seal.

Mainly at 3 o'clock:

A seal is a notice that the door is closed, when it was closed and who closed it (some are stamped).

A seal is equivalent to a big lock. If the seal is damaged, it means that the door has been opened or moved.

The seal is just a piece of paper, which blocks the gentleman, not the villain. If someone deliberately tore it up just for fun, there is no way out.