这是不是就是所谓的“买空卖空”的卖空，卖出一张货物合同，然后等待玉米价格下跌时再买入，这时可嫌差价？
Is that what is called taking a position 'selling a parcel for forward delivery but waiting for the price to go down before actual buying.
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.
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