钻石是已知的最坚硬的矿石。
世界上已知的鲸落不到50个。
地球是已知的唯一一个支持生命生存的星球。
很高兴见到你，第一个已知的穿越银河系来到地球的旅行者。
It's a pleasure to meet you, the first-known trans-galactic visitor to Earth.
已知的最早在英国定居的民族是凯尔特人。
The first people known to have settled in England were Celts.
这些结果很难与任何已知的原因联系在一起。
It is difficult to relate these results with any known cause.
你会联想到一些已知的东西，比如靴子的形状。
You made an association with something already known, the shape of a boot.
这是已知的。
科学家们已经确认了世界各地数千种已知的蚂蚁种类。
Scientists have identified thousands of known ants species around the world.
而且还要积极锻炼身体，因为锻炼是一种已知的大脑助推器。
And also get physically active, because exercise is a known brain booster.
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.
这样的探险可以追溯到古苏美尔时期，这是已知的最早的中东文明。
One can trace such expeditions back to ancient Sumeria, the earliest known Middle Eastern civilization.
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.
由于目前还没有已知的疫苗或治疗方法，下一次疫情爆发似乎只是时间问题。
With no known vaccination or cure available, it seems only a matter of time until another epidemic erupts.
已知的彩色海参类动物超过了3000多种，而且几乎每一天就可以发现一些新品种。
There are over 3,000 known species of these colorful sea slug relatives and new ones are discovered nearly every day.
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.
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.
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.
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.
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.
在对亚利桑那州坦佩的霍霍坎村进行挖掘时，发现了21件陶制狗像，这使得已知的狗像数量增加了近一倍。
That twenty-one ceramic dog figurines were discovered during the excavating of a 1,000-year-old Hohokam village in Tempe, Arizona, has nearly doubled the number of these artifacts known to exist.
事实上，在一些已知的案例中，母鸟有时会因为孩子被碰触而弃巢，仅仅因为它们是通过视觉而不是嗅觉发现的。
Indeed, in very few known cases, parent birds sometimes abandoned their nests from something touching their young, just because they noticed it by sight, not smell.
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.
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.
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.
虽然从外部到达夏威夷的植物种子品种可能比从内部到达夏威夷的品种要少，但已知的适应外部运输的品种比适应内部运输的品种要多。
While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.
在这个定义中，我们有一项是已知的。
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.
这是一段活生生的历史，它超越了我们已知的探索：一段更大的历史，在这段历史中，我们开始认识到每个参与者的贡献。
Here is a living history, which looks beyond what we already know about exploration: a larger history in which we come to recognise the contribution of everyone involved.
三叉神经痛，也称为抽动痛，有时被描述为人类已知的最严重的疼痛。
Trigeminal neuralgia, also known as tic douloureux, sometimes is described as the most excruciating pain known to humanity.
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