Commodity futures: futures contracts with physical goods as the subject matter.

Financial futures: futures contracts with financial products as the subject matter.

Margin system: when buying and selling futures contracts, traders have to pay a certain proportion of the contract value (generally 5%~ 15%) as a performance bond, so they can trade several times as much as the margin.

Multi-single opening: short positions and long positions are opened at the same time, and the transaction is made by long quotation, which reflects active buying;

Open positions with empty orders: both long positions and short positions are opened at the same time, and the transaction is made with short quotation, reflecting active selling;

Duoping: the bulls take the initiative to close their positions;

Short position level: short positions take the initiative to close positions;

Double opening: buy more new positions and sell more new positions, that is, both sides open positions;

Double-layer: the old seller closes the position, and the old buyer closes the position, that is, both sides close the position;

Pay more: the bulls change hands, the old ones sell their positions, and the new ones buy and open positions;

Short positions change hands: short positions change hands, old positions are bought and closed, and new positions are sold and opened.

Open position: refers to the number of closed contracts held by futures traders.

Warehouse receipt: refers to the standardized delivery certificate issued by the delivery warehouse and recognized by the futures exchange.

Forward market: Under normal circumstances, the futures price is higher than the spot price.

Reverse market: under special circumstances, the futures price is lower than the spot price.