与股票不同，衍生品通常是与交易所挂钩的预订合约。

Unlike equities, derivatives are usually bespoke contracts tethered to exchanges.

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四家交易所- - -芝加哥商品交易所，美国洲际交易所，伦敦国际金融期货期权交易所和欧洲期货交易所称它们今年打算对单名合约进行清算。

Four exchanges - the Chicago Mercantile exchange (CME), IntercontinentalExchange, Liffe and Eurex - say they intend to clear single-name contracts this year.

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也就是说，新的交易所可以不受限制的引入此类合约，但不得与现存的雷同——像洲际交易所在石油期货上做的那样。

That said, new exchanges are free to introduce contracts that are similar, but not identical, to existing ones-as ICE did so successfully with oil futures.

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We also have standardized contracts that are traded on exchanges and they're called futures contracts.

也有在交易所中交易的,标准化合同,它们被称做期货合约

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