The difference between now and 312 is:
312 incident: the market was declining every day, the exchange was paralyzed, and investors were about to collapse.
519 incident: the market fell to the ground in an instant, and the bottom was formed in three days. The entire market was shaky.
618 incident: the market fell all the way, dragged on for several weeks, and investors were in agony.
Now the market is still falling, it has been a whole month, and investors are about to become "fall experts".
