金融投机者不会实物交割，他们必须把要到期的合约卖出。
Financial buyers can't take physical delivery and must sell the maturing futures contracts.
对冲——以及对冲产生的利润和合约产量到期，随着天然气价格走低，新的对冲成本走高。
Hedges — and the profits they protect or generate — expire, and the cost of new hedges has been climbing as prices have been falling.
巴菲特预测几年后这些合约真正到期时，股票价格还会上涨。
Buffett said he expects stock prices to grow before the equity derivatives expire several years from now.
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