n.投机(买卖、交易、事业)，推测
Q.～demand投机造成的虚伪要求

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～enterprise投机事业

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～fever投机热

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～market投机市场

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～purchasing投机采购
P.～in securities 证券投机

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～in stocks股票投机

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～on foreign exchange外汇投机

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～on stock market 股票投机

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～on the rise and fall买空卖空

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～on the rise and fall of the market市场上的买空卖空
O.～and risk冒险投机

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he engaged in～in the stock market他在股票市场上做投机买卖

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the public's～about the association 公众对于该协会的推测