How to understand empty orders and multiple orders in stock index futures

In stock index futures trading, if it is judged that the market is going down, you can open a position to establish an empty order (an empty order is a current selling order); On the other hand, judging that the market is rising, you can open a position to establish a long order (multiple orders, that is, make a buying order at the price when placing an order now. See the figure below:

Futures exercise position

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