除了指数期货和期权，期货交易所亦买卖四种货币期货及30种股票期货合约。
Besides Index futures and options, the HKFE also traded in four currency futures and 30 stock futures contracts.
但是期货不像股票那样可以在各式各样得地点交易，期货合约几乎只可以集中在签订这一合约得交易所内进行交易。
Yet unlike shares, which can be traded in various venues, futures contracts are almost always concentrated on the exchanges that created them.
投机商可以低价买进股票，再将期货合约高价卖出，同时存储金属直到合约结束。
So speculators could buy stocks on the cheap, sell futures contracts at higher prices, and simply store the metal until the contracts fell due.
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