钻石是已知的最坚硬的矿石。
他的50万HIV阳性病例的估计是基于对已知病毒发病率的推断。
His estimate of half a million HIV-positive cases was based on an extrapolation of the known incidence of the virus.
"在二十世纪，已知有两次大型陨石与地球相撞的案例。
Twice in the twentieth century, large meteorite objects are known to have collided with Earth.
它已经向所有已知受地震影响的国家派遣了一个专家小组。
It has sent a team of experts to all countries known to be affected by earthquakes.
然而，已知最大的木制教堂是在12世纪30年代以后建造的。
However, the largest known wooden churches were built from the 1130s onwards.
大多数已知的太阳系外行星都居住在高度拉长而非圆形的轨道上。
Most known extrasolar planets reside in highly elongated, not circular, orbits.
这使它成为太阳系中已知最大的陨石坑，也可能是最古老的陨石坑。
That makes it the biggest known crater in our solar system and it may well be the oldest.
同一地理区域和同一时期的其他已知洞穴中，只有有关植物的绘画。
Other known caves from the same geographical area and time period contain only paintings of plants.
尸检分析显示存在一种尚未识别的病毒，以及一种已知细菌毒素的证据。
Postmortem analysis showed the presence of an as yet unidentified virus, as well as evidence of a known bacterial toxin.
我确定那是星期三，因为已知的公告是在发布日的三个工作日前提交的。
I am sure it was Wednesday because known announcements have been submitted three business days ahead of the posting day.
尸检分析显示出存在一种未知的病毒，以及一种已知的有毒细菌的证据。
Postmortem analysis showed the presence of an as yet unidentified virus, as well as evidence of a know bacterial toxin.
目前已知约有100人在这场被称为本世纪美国东部的最严重风暴中丧生。
About 100 people are now known to have died in what has been described as the worst storm ever to hit the eastern US this century.
我可以测量它了，因为我把它拉到了一厘米，我发现它对一个已知质量施加的加速度。
I can measure that, because I pull it by one centimeter and I find the acceleration it exerts on a known mass.
他推断，已知的一些单细胞生物进入类似冬眠的状态，在没有空气和食物的情况下存活数年。
He reasoned that some single-celled creatures are known to enter a hibernation-like state and survive for years with no air or food.
蝎尾兽是潘多拉星球上最可怕的食肉动物，从外表上看，它可能是已知宇宙中最强悍的食肉动物。
The manticore is the most fearsome of Pandoran predators, and by the look, it might be the toughest carnivore in the known universe.
在任何一年中，大约有十几颗已知的彗星在其轨道中接近太阳。当然，一般人看不到所有的彗星。
In any given year, about a dozen known comets come close to the sun in their orbits, the average person can't see them all, of course.
火星表面显示出广泛的地质特征，包括巨大的火山——太阳系中已知的最大的火山——和广阔的撞击坑。
The surface of Mars shows a wide range of geologic features, including huge volcanoes—the largest known in the solar system—and extensive impact cratering.
科马提岩于1969年首次被发现，它是地球上已知的最古老的火山岩，含镁量是大多数火山岩的三倍。
First identified in 1969, komatiites are Earth's oldest known volcanic rocks and contain three times as much magnesium as do most volcanic rocks.
也许他心里知道，人类已经征服了半个已知的世界，掠夺了整个王国，并且从来没有到达过如此奢侈的地方。
Perhaps he knew in his heart that men have conquered half the known world, looted whole kingdoms, and never arrived in such luxury.
虽然从理论上讲，这是一项研究索伦特海峡中已知沉船的计划，但麦基真正希望的是找到玛丽·罗斯号战船。
While on paper this was a plan to examine a number of known wrecks in the Solent, what McKee really hoped for was to find the Mary Rose.
如果已知“黑人”与“非裔美国人”被看待的方式不同，研究人员到目前为止还没有确定那种认知差异是如何产生的。
If it was known that "Black" people were viewed differently from "African Americans", researchers, until now, hadn't identified what that gap in perception was derived from.
间接相互作用导致的已知物种灭绝或破坏的情况的稀少，反映的或许不是这种灾难的罕见，而是没有去寻找或检测它们。
The paucity of known extinctions or disruptions resulting from indirect interactions may reflect not the infrequency of such mishaps but rather the failure to look for or to detect them.
到目前为止，这种绿色的海参是已知唯一一种真正由太阳能驱动的动物，尽管有些动物确实能表现出一些植物般的行为。
So far, this green sea slug is the only known animal that can be truly considered solar-powered, although some animals do exhibit some plant-like behaviors.
白腹树袋熊，作为一种已知的生物，是一种生活在森林里的有袋类动物，大部分时间生活在地面上，它的颜色非常鲜艳。
The Dingiso, as the creature is also known, is a forest-dwelling marsupial with bold coloration that spends most of its time on the ground.
相比之下，由于沉积作用在大陆地区的连续性要小得多，因此根据已知的上下岩层的年龄来估计一个大陆岩层的年龄风险更大。
By contrast, because sedimentation is much less continuous in continental regions, estimating the age of a continental bed from the known ages of beds above and below is more risky.
同一地区另一个著名的坟场是个叫做惠灵顿洞穴的地方，人们在那里第一次发现了双门齿兽——目前已知的最大的有袋类动物。
Another famous boneyard in the same region is a place called Wellington Caves, where Diprotodon, the largest known marsupial, was first discovered.
来自公元前3000年左右的一块苏美尔的雕刻陶土板提供了已知最早的例证：一个带顶棚的箱状雪橇被安装在四个实心的轮子上。
A tablet engraved about 3000 B.C.E. provides the earliest known example from Sumer, a roofed boxlike sledge mounted on four solid wheels.
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