Although domestic stock index futures and commodity futures have the problem of delivery date, we can continue to hold them by changing positions and changing months, and change the near-month contract that is about to expire into a far-month contract, which is equivalent to holding them in disguise. If you don't untie them, you can continue to move the warehouse if you have more money. Of course, there may be the cost of moving positions, and the premise of closing positions is that the future price will return to your intervention point.