It is useless to speculate why he did it.
对他为什么这么做妄加猜测毫无用处。
It's always hard to speculate about the future.
推测未来总是很难的。
It's tempting to speculate about what might have happened.
大家不禁猜测，到底发生了什么事。
This has led scientists to speculate on the existence of other galaxies.
这就使得科学家推测还有其他星系存在。
We can speculate that the stone circles were used in some sort of pagan ceremony.
我们可以推测，这些石头排成的圆圈是用于某种异教崇拜仪式的。
The doctors speculate that he died of a cerebral haemorrhage caused by a blow on the head.
医生们猜测他死于头部撞击引起的脑溢血。
I mean it's interesting to speculate.
我的意思是，这是很有趣的推测。
He has bought himself time by refusing to speculate publicly on the cause of the blast.
他拒绝公开推测爆炸原因，为自己赢得了时间。
He refused to speculate on the possible effects on relations between the two governments.
他拒绝猜测这对两国政府关系可能产生的影响。
Other researchers speculate that sauropods ingested these stones as a source of some the minerals they needed, such as calcium.
其他研究人员推测，蜥脚类动物吞食这些石头是为了获取它们需要的一些矿物质，比如钙。
The researchers speculate that craft activities promote the development of nerve pathways in the brain that help to maintain cognitive health.
研究人员推测，手艺活动促进了大脑神经通路的发展，有助于保持认知健康。
"We can only speculate as to how the Egyptians could have laid out these lines with such precision using only the tools they had," Dash writes.
达什写道：“我们只能猜测，在仅用当时的工具的情况下，埃及人是怎样做到如此精确地铺线的。”
Some scientists speculate that Mars may have enjoyed an extended early period during which rivers, lakes, and perhaps even oceans adorned its surface.
一些科学家推测，火星在早期很长时间里可能都有以河流、湖泊，甚至海洋装点着它的表面。
Studies on nonalien species have not produced similar results, leading researchers to speculate that avian social learning may be fundamentally different from that of mammals.
对非外来物种的研究没有得到类似的结果，这使得研究人员推测鸟类的社会学习能力可能与哺乳动物的社会学习能力有根本性的区别。
This, in turn, has a major effect on their diet, leading scientists to speculate that the ability to learn population-specific hunting methods could be driving the animals' genetic development.
这进而对它们的饮食产生了重大影响，促使科学家们推测，学习特定种群狩猎方法的能力可能推动了这些动物的基因发育。
He likes to speculate on the stock market.
他喜欢炒股。
He did not speculate on the future of his tenuous career.
他没有考虑到自己不稳定的职业前景。
It is premature to speculate about the resumption of negotiations.
考虑谈判的恢复还太早。
People speculate about virtuality systems, but we're already working on it.
人们对虚拟系统尚存疑虑，而我们已经在开发了。
Critics of the project speculate about how many hospitals could be built instead.
该项目的批评者们则猜想这相当于可以建多少家医院。
We'll never really know of course, though it's interesting to speculate.
当然，我们永远也不会真正了解，尽管推测起来很有趣。
State and defend your opinion, analyze the issues, speculate about how things might have turned out differently.
陈述并捍卫你的观点，分析问题，思考事情可能会有怎样的不同结果。
推测是容易的。
第六，永远不要投机。
我们对市场进行展望。
罗琳：你是这样猜测的？
The doctors speculate that he died of cancer.
医生推测他死于癌症。
“People are beginning to speculate, ” he says.
他说：“人们会禁不住开始猜测。
We speculate there may be neutronic mail here.
我们推测这应该有电子邮件。
We speculate there may be neutronic mail here.
我们推测这应该有电子邮件。
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