事实上，他们是在卖出看跌凭单，并且，他们严重低估了其风险。

In fact, it was selling bear-market warrants and it severely underestimated the risk.

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墨西哥购买了看跌期权——令持有者有权以预订价格卖出石油的合约。

Mexico bought put options - contracts that give the holder the right to sell oil at a predetermined price.

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除了卖出大豆或者玉米的看涨期权，可以保持在这些市场里做空看跌期权并且卖出你的小麦看涨期权。

Instead of selling bean or corn calls, stay short the puts in these markets and sell your calls in wheat.

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