Short position refers to the total loss of your margin and the loss of the futures company's margin;

Experience in holding positions means that your margin is still left, but it is not enough to hold the margin of the remaining contract, and actually has occupied the margin of the futures company;

When your margin is not enough to hold a certain number of futures contracts, the futures company has the right to forcibly close some or all of your positions, and the consequences will be borne by you.