speculate 的形容詞用法是 speculative（聽發音），例如推測的市場趨勢英文是 speculative market trends，不過 speculative 這個英文單字含有一些＂投機性＂的概念，例如 speculative risk 就是投機風險，所以不能隨便亂用。
推測的英文名詞用法是 speculation（聽發音），例如科學家經常使用的實驗推測英文是 experimental speculation、業績推測英文是 sales performance speculation。
推測英文造句練習
Michael's job is to speculate how many inventory of warehouse needs from sales data.麥可的工作是從銷售數據推測倉庫所需要的庫存量。
Analysts speculated that the stock market will have changed dramatically.
分析師推測股票市場將有大幅度改變。
Government speculate Taiwan needs more foreign tourists to increase the economic performance of tourism.
政府推測台灣需要更多外國旅客來增加旅遊業的經濟表現。
Many foreign professional automotive media speculated that the new BMW 5 Series will have a better performance.
國外許多專業的汽車媒體都推測 BMW 新的 5 系列將會有更好的性能表現。
Some economists speculate that the economic environment in 2017 will be worse.
有經濟學家推測 2017 年的經濟環境將會更糟糕。
Environmental groups have speculated that humans create pollution let many biological died out.
環保團體推測人類創造的污染已經讓許多生物滅絕。
Film experts speculate that the future movies will use more computer-animated.
電影專家推測未來的電影將會使用更多電腦動畫。
Zoo official speculated that the park panda will soon be pregnant.
動物園官方推測園區內的貓熊即將懷孕。