speculate about/on/upon sth
常用于对未知原因或结果的推测。
Journalists are speculating about the reasons for his resignation.
记者们正在猜测他辞职的原因。
猜测；推测
投机；做冒险交易；推测执行；提前执行；根据不确凿的证据进行推断；猜测或推测。；进行冒险交易以期望获利；投机或赌博。；预判将选择哪条代码分支并提前执行。
to make a guess based on incomplete information
根据不确凿的证据进行推断；猜测或推测。
To make an inference based on inconclusive evidence; to surmise or conjecture.
进行冒险交易以期望获利；投机或赌博。
To make a risky trade in the hope of making a profit; to venture or gamble.
预判将选择哪条代码分支并提前执行。
To anticipate which branch of code will be chosen and execute it in advance.
一般现在时
He often speculates about the future of technology.
他经常推测技术的未来。
现在进行时
They are speculating on the stock market these days.
他们这些天在股市投机。
一般过去时
She speculated that the meeting had been cancelled.
她猜测会议已经被取消了。
规则动词，过去式和过去分词加-ed。
People like to speculate about the reasons for the sudden change.
人们喜欢猜测突然变化的原因。
用法提示：此处 speculate 作动词，意为“猜测”，后接 about 引出猜测对象。
The journalist speculated that the company might announce a merger soon.
记者推测这家公司可能很快宣布合并。
用法提示：speculated 是 speculate 的过去式，表示“推测”，后接 that 从句。
Without more facts, we can only speculate what happened.
没有更多事实，我们只能推测发生了什么。
用法提示：speculate 作动词，表示“推测”，用在情态动词 can 之后。
常用于对未知原因或结果的推测。
Journalists are speculating about the reasons for his resignation.
记者们正在猜测他辞职的原因。
后接that引导的宾语从句。
Some analysts speculate that the company will merge with a competitor.
一些分析师推测该公司将与竞争对手合并。
指商业投机，尤指风险投资。
He made a fortune by speculating in real estate.
他通过投机房地产发了财。
as to后接疑问词引导的从句，较正式。
They speculated as to whether the project would be completed on time.
他们猜测项目能否按时完成。
比 speculate 更正式，常用于书面语
较口语化，比 speculate 更随意
与 speculate 接近，但更强调基于少量证据
grammar · medium
易错句子I speculate the reason for his absence.
正确表达I speculate about the reason for his absence.
动词‘speculate’作‘推测’讲时是不及物动词，不能直接跟宾语，需加介词‘about’或‘on’再接宾语。
grammar · medium
易错句子She speculated to invest in that company.
正确表达She speculated about investing in that company.
‘speculate’表示‘投机’时，后面不能接不定式‘to do’，而应接介词‘about’或‘on’后跟动名词。
推测，猜测
The media speculated about the reasons for his resignation.
媒体猜测他辞职的原因。
投机，推测
He made a fortune by speculating on the stock market.
他通过股票投机发了财。
猜测...
Some analysts speculate that the company will merge.
一些分析师猜测该公司将会合并。
胡乱猜测
Without evidence, people began to speculate wildly.
在没有证据的情况下人们开始胡乱猜测。
无休止地猜测
They would speculate endlessly about the outcome.
他们会无休止地猜测结果。
投机（某种商品或股票）
Many investors speculate in real estate.
许多投资者投机房地产。
与投机含义相关，都涉及资金运作
与推测含义相关，都涉及基于不充分信息的思考
投机往往伴随风险
股票市场常见投机行为
推测常基于假设进行
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY, WORDNET.