而当他将来卖出手中的多头合同时，他又增加了期货石油的供应，从而降低了期货石油的价格。
When he sells his long contracts in the future he would increase the supply of future oil, hence lowering future oil prices.
当你在现货市场上买入玉米时，你可同时在期货市场上卖出一张等同数置的玉米期货合同，因为你预测玉米价格将会下降。
When you buy the corn from the cash market, you can sell short a futures contract of the same amount com on the futures market in anticipation of the com prices falling.
同时，买进期货合同和卖出一个看涨期权的组合，叫做组合卖出看跌期权。
Also, a combination of a long futures contract and a short call, called a synthetic short put.
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