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。
This iridium anomaly offers strong support for the Alvarez hypothesis even though no asteroid itself has ever been discovered.
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。
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.
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。
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.
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。
They had found, accidentally, that a rare metal, iridium, suddenly became very abundant exactly at the boundary and then slowly fell away.
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。
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.
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。
Iridium occurs in meteorites and volcanic material, but in the latter case it is accompanied by elevated levels of nickel and chromium.
人们发现，在一些保存着太阳系原始化学成分的陨石中，铱元素的含量很高。
Ir is found in high concentrations in some meteorites, in which the solar system's original chemical composition is preserved.
确实，有些地方发现了有两个铱层。
事实上，在某些地方发现了两个铱岩层。
他们也在寻找一种比铱更便宜的催化剂。
之后他们计算了铱层上的物种。
铱大概是最好已知有很多原因。
Iridium is probably the best known for a variety of reasons.
使用同样方法，铱被熔合与铑。
在这些材料中，金属铱配合物最为有效。
在某些情况下，我们必须用铱卫星电话交流。
On some occasions, we would have to use Iridium satellite phones for communication.
他们对30英尺深度略高于铱层的一个沉积层特别感兴趣。
They were especially interested in a 30-ft. layer of sediment just above the iridium layer.
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%。
Change the 20-nanometer iridium to same-sized soot particles and the uptake rate falls by 75 percent.
简要介绍锇铱矿的基本特征和资源状况，生产及处理工艺。
The basic characteristics of osmiridium, and its resources production and processing were discussed.
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。
Something the researchers have not found in this layer is iridium, or at least not a lot of it.
一般加入少量的铱形成更硬、更强的合金，而又包括了铂的优点。
Small amounts of iridium are commonly added for a harder, stronger alloy that retains platinum's advantages.
主要矿物是自然铂矿、铁铂合金、钌铱锇矿、等轴锇铱矿和铱锇矿。
The trace element Rh exists mainly in native platinum, platinum-iron alloy and Pt-containing osmiridium.
如果你想要铱银2008奔驰，在杂志中找到它的照片，用单独一页描述该目标。
If you wanted that iridium silver 2008 Benz, then find pictures of it in magazines and make a page exclusively dedicated to that goal.
本论文研究了铱催化的喹啉和吡啶衍生物以及环外烯胺的不对称氢化。
In this dissertation, Ir-catalyzed asymmetric hydrogenation of quinoline derivatives, pyridine derivatives and exocyclic enamines have been studied.
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。
Until now, most approaches relied on impractically scarce materials like iridium as a catalyst that triggers the reaction.
彗星是由“脏冰”所组成，而不是像小型那样由固体岩石组成，所以只含有少量的铱。
Comets consist of "dirty ice", rather than solid rock, and so contain little iridium.
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。
In this way it would act like an 'iridium flare.' The flares are created by sunlight reflecting off iridium satellites.
这些研究人员还在寻找更便宜的催化剂。现在的铱催化剂相对来说比较昂贵。
The researchers are also seeking a catalyst that is cheaper than one based on iridium, which is relatively expensive.
他们将其重新编程，使一段带有催化剂——氧化铱，另一端则带有光敏色素锌卟啉。
They engineered it so that one end carries a catalyst-iridium oxide. Bound at the other end are light-sensitive pigments, zinc porphyrins.
他们将其重新编程，使一段带有催化剂——氧化铱，另一端则带有光敏色素锌卟啉。
They engineered it so that one end carries a catalyst-iridium oxide. Bound at the other end are light-sensitive pigments, zinc porphyrins.
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