期货合约是交易双方就在未来确定的时间和地点，按确定的价格交换某种商品的一种承诺。
Futures contracts are a promise between two parties to exchange a commodity at a specified time and place in the future for a stated price.
在实物商品市场，参与人士可将实物商品用于交换现金或交割到期的期货合约。
Commodity market where physicals are exchanged for cash and are deliverable against maturing futures contracts.
向前交易与被交换的期货合约在经济上是相同的。
Forward transactions are economically similar to exchange-traded futures contracts.
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