form a theory or conjecture about a subject without firm evidence
推测
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my colleagues speculate about my private life 我的同事们猜测我的私生活
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[with clause]
observers speculated that the authorities wished to improve their image. 观察员们推测当局希望能改善他们的形象。
invest in stocks, property, or other ventures in the hope of gain but with the risk of loss
做投机买卖
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he didn't look as though he had the money to speculate in shares. 他看上去不像有钱做股票投机的。
"late 16th cent.: from Latin