Bank's covering positions: when buying stocks, it will cover positions. Only by buying at the low position of this stock can we make up the position and share the cost equally. This is called replacement.

Add one thing:

Bank liquidation: refers to the behavior of futures traders to buy or sell futures contracts with the same variety, quantity and delivery month, but in the opposite direction, and liquidate futures transactions. Simply put, it means "sell what you bought and buy what you sold."

Tip: Before buying stocks, you must think it over and understand it well to avoid the situation that stocks are locked up.