This iridium anomaly offers strong support for the Alvarez hypothesis even though no asteroid itself has ever been discovered.
这一铱异常为阿尔瓦雷斯假说提供了强有力的支持，尽管小行星本身从未被发现。
They had found, accidentally, that a rare metal, iridium, suddenly became very abundant exactly at the boundary and then slowly fell away.
他们偶然发现一种稀有金属铱的含量在边界处突然变得很丰富，然后又慢慢地消失了。
An iridium-enriched sediment layer and a large impact crater in the Yucatn provide evidence that a large meteorite struck Earth about 65 million years ago.
尤卡坦半岛上富含铱的沉积层和一个巨大的陨石坑提供了证据，证明了约6500万年前，一颗大型陨石撞击了地球。
This sediment layer is enriched in the rare metal iridium and other elements that are relatively abundant in a meteorite but very rare in the crust of Earth.
这一沉积层富含稀有金属铱，以及其他在陨石中较丰富而在地壳中十分罕见的元素。
Debris thrown into the atmosphere by an asteroid collision would presumably contain large amounts of iridium, and atmospheric currents would carry this material all over the globe.
小行星碰撞后的碎片可能会含有大量的铱，而大气洋流会把这些物质带到全球各地。
They're also seeking a cheaper catalyst than iridium.
他们也在寻找一种比铱更便宜的催化剂。
Something the researchers have not found in this layer is iridium, or at least not a lot of it.
在这个木炭层中，研究人员并没有发现铱，或者至少不是大量的铱。
Change the 20-nanometer iridium to same-sized soot particles and the uptake rate falls by 75 percent.
若用相同大小的20纳米烟尘颗粒替换铱粒子，则摄入率降低75%。
Indeed, two iridium layers have been found in some places. Anjar, an Indian town north of the impact site, is one.
的确，在一些地区已经发现了2层铱矿，位于撞击点北部的印度城镇Anjar就是其中之一。
In this way it would act like an 'iridium flare.' The flares are created by sunlight reflecting off iridium satellites.
依此思路推测，它有点像“铱闪光”，它是由太阳光反射到铱卫星上所产生。
Until now, most approaches relied on impractically scarce materials like iridium as a catalyst that triggers the reaction.
到目前为止，大部分方式还在依赖象铱那样不实用的稀有原料作为引发反应的催化剂。
This story, though, raises the question of why there is but a single ejecta layer of iridium and shocked quartz in late Cretaceous rocks around the world.
然而，查特基博士的说法引发了疑问：为什么全球白垩纪晚期岩石中含有冲击石英和铱的喷发物地层只有一层？ 答案或许是，两次撞击是在同时发生的。
In one case, executives discovered a coating advertised as pure gold that masked a complex alloy, which included rare metals such as osmium, iridium, ruthenium and rhodium.
在一个案例中，业内高管发现一种号称纯金的涂层其实是一种复杂的合金，含有锇、铱、钌、铑等稀有金属。
The team is also working to find a more commonplace, less-expensive material for the catalyst, to replace the relatively rare and costly iridium used in this proof-of-concept study.
该小组还正在努力寻找一种更常见的，更便宜的催化剂，以代替在验证性概念研究中使用的相对昂贵和稀有铱催化材料。
Thales Alenia is building the next set of 66 Iridium low-Earth orbiting (LEO) satellites.
泰雷兹阿莱尼亚公司正在建造66颗下一代低轨道(LEO)铱星。
Iridium also has participated in testing its Netted Iridium service with the U.S.Marine Corps Warfighting Lab.
铱星还参与了与美国海军陆战队作战实验室联网的铱星服务试验。
Iridium also has participated in testing its Netted Iridium service with the U.S. Marine Corps Warfighting Lab.
铱星还参与了与美国海军陆战队作战实验室联网的铱星服务试验。
Iridium also has participated in testing its Netted Iridium service with the U. S. Marine Corps Warfighting Lab.
铱星还参与了与美国海军陆战队作战实验室联网的铱星服务试验。
Chang 'e 3 is supposed to launch sometime in 2013 and land in Sinus Iridium, where it will deploy an autonomous rover.
嫦娥3号计划在2013年的某个时间发射，计划在彩虹湾着陆，并在那里部署一个自动登月车。
A spokesman said: 'Each Zafirro Iridium is custom made from the strongest, purest, and most durable materials available anywhere.
一位发言人表示：“每支铱金蓝宝都是用最坚韧的、最纯净的和最耐用的稀有材料量身打造的。”
Iridium occurs in meteorites and volcanic material, but in the latter case it is accompanied by elevated levels of nickel and chromium.
铱存在于陨石和火山物质中，但在火山物质中同时包含高浓度的镍和铬。
The new network will maintain the Iridium constellation architecture of 66 cross-linked LEO satellites covering 100 percent of the globe.
新网络将保持66颗跨链低轨卫星的星座体系，覆盖全球所有区域。
Bright north star Polaris stands above the peak in an exposure that also captures the brilliant trail of a polar orbiting Iridium satellite.
峰顶正上方是明亮的北极星，这次曝光正好逮住了一颗极轨铱星的闪光。
One wasn't really anyone's fault: a random collision in 2009 between a long-defunct Russian military spacecraft and an Iridium commercial communications satellite.
一件事实上不是任何人的错：2009年发生在一架长期废弃的俄罗斯军用航天器和一颗铱星商用通讯卫星之间的一次随机碰撞。
Another source of bright drifting objects, Iridium communication satellites, may even appear to flare up to become brighter than any other sky object for a few seconds.
铱星通讯卫星是另一个发光漂移物的可能来源，它可能突然闪耀几秒钟，甚至看起来变得比天空中的其它物体都要亮。
Iridium, usually used in space rockets, is ten times rarer than platinum and highly resistant to heat so theoretically it can be dropped it into lava, and it will not melt.
铱，通常被用于太空火箭，比铂金稀有十倍并且高度耐热，因此理论上即使它掉进岩浆中也不会熔化。
Iridium, usually used in space rockets, is ten times rarer than platinum and highly resistant to heat so theoretically it can be dropped it into lava, and it will not melt.
铱，通常被用于太空火箭，比铂金稀有十倍并且高度耐热，因此理论上即使它掉进岩浆中也不会熔化。
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