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v.投机,做投机买卖;推测,推断

来源于拉丁语specere(看)派生动词speculor, speculari, speculatus, -(观察,侦查)。

拆分: -specul-看 + -ate动词词尾 ⇒ 观察、侦查以便进行推测和投机 

例:
to speculate in stocks 股票投机
to speculate about future life 预测未来生活
We don't know all the circumstances, so it would be pointless to speculate. 我们不了解所有的情况, 妄加推测是没有意义的。 
He speculated that he would succeed. 他推测他将成功。 
to speculate about the origin of the universe 推测宇宙的起源