已知接触铅会损害幼童的大脑。
Exposure to lead is known to damage the brains of young children.
钻石是已知的最坚硬的矿石。
我已知道数日不吃东西是什么滋味了。
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.
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.
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.
这是已知的。
"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.
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.
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.
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.
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.
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.
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.
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